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Just my 2 cents for anyone looking to buy GW2.
Lovely gfx engine and game world - GW2 looks great and scales well on most systems. The animations in combat are fluid and the character and world models throughout the game are well done.
Decent "Questing system" - The events system (its not dynamic) is a new and fun way to get you questing without you feeling like you are questing. As a long time MMO player I found it a refreshing change even if it's still the same "kill x, collect w, revive y" quests they are presented in such a way that you are taking up in the illusion you are helping. The other great thing about the questing system is it gets everyone working together. I would like to say this is down to everyone wanting to helping each other but in reality its purely due to the fact that helping other helps you. There is no "my mob" tagging or exclusive kill credits in this game, it employs a "what you touch you may share in" system. On paper this sounds great but in reality it just turns every event into one giant AoE cluster of chaos.
Crafting - I'm not much of a crafter in MMOs and choose to do so more because it helps my character rather than because I enjoyed it. This is not the case in GW2. I found the crafting system both fun and useful with a good level of reward for doing so. There are I am sure millions of post detailing the crafting system so I am not going to delve into its inner workings but I had a lot of fun with it.
Lots to see and do - There are a huge amount of things to see and do and the environment is really enriched with ambience. This is in part due to the aforementioned events system but also thanks to a decent arts and creative team.
Down leveling - Down leveling is something that I was in two minds about when I was reading about it. However after having played the game I have to say it's a real positive aspect of the game for me. It means exploring "newbie" zones is no longer a snooze fest and that you can go back and do other races starting zones and still have fun and be rewarded for doing so. It also helps greatly with the whole paring up with a lvl 50+ friend or guildy with no life and 600 hours play time (some exageration there but you get the idea) and not having it be a total face roll.
The community - It's been very refreshing for me to such a good crowd of people striving to help each other in chat channels. People were quick to offer help and advice when "less researched" members of the community were struggling or had issues. People were also helping out in the field too, ressing people and reviving where possible. I know there are XP rewards for ressing and reviving people gives you another body to throw at the boss but whether it was due to people helping others to help themselves or people just being selfless it felt good and worked well.
Looting and Gathering - Every mmo needs to follow GW2 on this imo. You don't have to worry about some douche coming to steal your wood/ore/plant while you finish off a mob guarding it as all the nodes and loot are instanced meaning you never have to fight anyone for the same node. This again through good game design creates a better community where by instead of someone coming in to ninja your node while you kill the mob, they will most likely help you kill the mob as they may get some loot and then harvest the same node you were after without taking it from you. This leads to a better experience for everyone.
The Professions -: I know I am going to take a lot of flak here for this one but here goes. While I have few issues with the classes (let's call them what they are) the lack of ability to fill a role I found deeply annoying. I am fine with there not being a set tank class, healer class but at least allow (either with a certain skill set or weapon combo) a class to be able to fill in a certain role. The problem I am describing is not really exposed in the normal mobs or regular events system due to those being unskilled button mashing AoE light shows. Where this is a lot more evident is in instances and event boss fights. The only way I can describe it is chaos, sometimes organised but chaos none the less. With no set roles for any of the classes it really seems that it's just a question of throwing bodies at a problem and trying to do as much damage while reviving downed foes. There is no resource management, it's just a question of how quickly can I rotate through my CDs on one weapons set before moving to the other in pve. This brings me on to the skills which in general are incredibly dull and generic, you almost feel forced to use them in PVE just because they are off CD rather that to react or respond to an issue. The skills system seems purely designed to maintain control over PVP balance rather than create fun PVE play. This was the real deal breaker for me in the game, flame me, call me a traditionalist but the lack of defined roles meant everyone was trying to do a bit of everything and it just doesn't work for me in PVE. If this isn't an issue for you and you are here mainly for PVP then I am sure you will have a great time in this game. I am a big fan of PVE and classes just feels unstructured and empty to me in PVE, I love PVP too, but I have many other games that fill that void.
The lighting and skill effects - Partly related to what I've said above but the fancy flashing lights and spell effects get old really fast. When you are trying to avoid being one shotted (despite being in full vit/toughness gear) by avoiding a faint red cricle and 3 eles come and shove their lovely coloured circles of fire etc under the boss while 2 others bubble up the area to set off more coloured lights it really just becomes a screen full of meaningless effects and lights leaving you wondering why you are now dead on the floor despite only being blinded by all the effects for a few second.
Grouping up: Whilst the downscaling system should make for a great grouping experience the painfully bad design of the overflow system and the bugs with the "join X in zone" on the party frame, along with map and party frame update issues make what should be a quick easy bit of fun turn into a painful 20 min long set of "Are you in the overflow? Why can't I see you? Where are you on the map?". This I could forgive early on if it happened once or twice but it happened so many times to the point where guildies and friends couldn't be bothered to group up if they were just on for a quick 30 mins. This imo is criminal. How when an mmo is all about playing with others did such a useless system get through to launch despite it being reported to death in beta? Yes they have acknowledged the issue and I'm sure over time it will get fixed but it's not really forgivable to have issues with grouping up with people when that's a good part of what an MMO is about.
Trading post - MMOs are lots of different things to different people, if you are one of those mmo players who loves to play the economy and build up a personal empire steer clear of this game for a while. The trading post is constantly screwed with access limited to 20% of the population while they continue to test it out. Although this is a bit of a gripe for me I know how complex mmos are to develop and there are bound to be some teething issues but to have your whole trading system down for launch is not great, to have it still down a week+ after launch is pretty unforgivable.
Conclusion: I really tried hard to like this game as it has a lot going for it but in the end the lack of class roles and grouping issues left me wanting a refund. I will drop into the game every now and then to see if anything changes but I feel disappointed. My main reason for writing this is in the hope it saves a few people some money buying a game that isn't for them. I know however there are a lot of people having fun playing this game and I hope they continue to do so as it is a great game for certain mindsets just not for me.