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I'm not sure if there are many people like me on this site. I've played Guild Wars II since a week after it launched and my main has just reached level 68 and apparently I have completed just 29% of the world map. I only play PvE. I am guildless and I mostly play alone. I play a thief.
Anyhoo, thought I'd write down some impressions for those of you who are perhaps as slow as me.
Firstly, Guild Wars 2 is good value for the slow play style. It takes me months and months to level to cap and to (i) not pay a subscription but (ii) play a recently released MMO is a relief compared to what was the norm for me.
For the explorer, the world is beautiful and full and fun. Exploring is rewarded by the game in several ways. The rewards and letters from the Explorer Society as you "complete" sections of the map are really fun and I get more satisfaction receiving these than I ever do from leveling up.
The vistas are pure genius in my eyes. As is the level scaling which means you kind of ignore your level most of the time. The effect of this is not to be underestimated because as an Explorer it radically changes the range of places that are fun to explore because there is still the element of danger. And this means the world has always felt huge to me.
I heartily recommend trying your hand at cooking which is a challenging craft but ideal for explorers because every now and again you stumble on a patch of potatoes or sugar pumpkins growing in a hostile area. I sometimes buy eggs and butter as I am forever running out of them but I try not to. As much as I hate cooking in real life, discovery mode is so much fun where you just try different combinations and have access to all your cooking ingredients (most are "collectibles" and do not occupy bag space as such).
The cooking craft enables you to make dyes as well, which are kind of fun to discover and fool around with at a quiet moment.
Now to the most important thing: combat. I feel like I've only scratched the surface with what my character can do. I think in this game more than any other I have played except maybe Darkfall you can be "skilled" at fighting or not and that includes thoughtful choices about which skills you select for what situation (before the combat starts). Toss in under water combat (your weapon changes and so does your skill set) and the downed state mechanism (a small set of skills you can use near death to recover your feet) and how some skills can interact with the skills other players are using... phew, it can be all a bit overwhelming at times.
I can get annoyed with occasional lag in combat, like when I think I've just brilliantly dodged that Ettin's crushing blow but I haven't. I live in Australia though so some lag isn't surprising. I also get stuck in combat a lot.
You can manage the difficulty level of the game in a few ways. While your level and stats are scaled down, as say a level 50 player exploring a 20-30 zone you will have more powerful skills and better ranking gear and things will be easier. It isn't difficult to find challenge either. Taking on several enemies at once guarantees to make things interesting.
I've ignored my personal story. I hate the voice of my male human and generally found the voice acting to be cringe-worthy; the story is really for 12-year olds not adults.
One of the best things of the game is that seeing another player is always a good thing. They aren't going to "steal" that patch of mature herbs and they aren't going to take your kill and they aren't going to make the event too easy. It is very natural for players to cooperate for a time and then go their own way. The design brilliance from Anet sometimes has me shaking my head in admiration.
I can see Guild Wars II being my MMO home for a very, very long time.