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Before I get started, I want everyone here to know that I am a very negative person, and will focus more on the bad than the good, so lets begin.
Style: The anime theme is very rarely well done, and in this case it is well done, undeniably. The idea of a side scrolling mmo is to this day an amazing idea, it also gives them to ability to work more on art and style as opposed to making sure that the game looks real.
Players: The amount of people that play this game is incredible, and if you ever find someone who bothers you immensely, you can change your channel (sub server) at any time.
Game-play: Very entertaining, and fun to watch. The combat can be fun depending on your class. For example I believe thieves and warriors have a damn good time slicing slime. Where as archers just kind of watch the arrows move across the screen. The game doesn't have much more than combat considering the quests aren't that great.
Classes: The class system fits everyone, at least in my opinion, very easily and is the level of simplicity that makes Maple Story the game that it is.
Style: If you are not into the anime feel or the idea of a side scrolling mmo confuses you, you will hate this game. If you appreciate good graphics as opposed to style, you will hate this game.
Players: The players, although abundant, are %^&*ing idiots. I would say most to all of them are absolutely borderline retarted. Each second you spend in a crowded city is one step closer to joining in on a chuck Norris joke. Pretty soon you'll be one of the many Inuyasha507's. It's similar to the effect.
Game-Play: I compare the grind in this game to Lineage 2. If you haven't played L2 let me explain. Around level 20 (many will reach this level so I think its good to use it) you will get about .2-.4 xp per kill. Let's say you have a quest to kill 999 of some crazy monster (Not shitting you), once you kill all 999 of those, at the best case scenario of you getting .4% per kill, you would barely level up 2 times due to the xp decrease per level. Once completed the quest holder will give you a HEFTY -holds breath- 5% The worst part is yet to come. The MS team is very money hungry, and since advertising and merch wasn't enough, they added the most insane payshop man has ever seen. Let me elaborate, the only way to not look like a douche, have good equipment, pets, items, in general character enhancments, is to turn Maple Story into a p2p mmo. Although they love to tell you just how free it is in every ad. To finish this section, the quests are monotonous, and we're enough to make me quit. The monotony and lack of them.
Classes: There are some people who hate the idea of a simplistic class system that becomes more involving over time as opposed to never advancing and staying relatively the same.
What it comes down to is, if you can handle a shit community, mind numbing quests, don't mind a grind that makes asians want to quit, payshops, and basic classes then you should have a good time. If ANY ONE of these hits you wrong though, do not play because it will without a doubt be your reason to quit. I hope this review helps someone, good luck mapling if you choose too.