I loved how it was different from your standard, stand and bang MMO norm. You need to think and move and dodge or you will die. I like how you have two weapon types so you can switch creating different play styles.
Most of all I love the active world. Typical wow quest of "kill those centaurs, they will attack our town" as they stand milling around a field, for ever doing nothing. Then the gw2 approach to "kill those centaurs they will attack our town" The centaurs are holding a fort, you do nothing they push further and assault the second fort, you do nothing they attack the town, you do nothing the town is gone and none usable to players. If you act, and win, you take the fort and push the centaurs back. You take a bridge back they have built. You then attack their fort and kill their leaders, you destroy their camp. They then try a counter attack and if you defeat their chief you have won.. For now.
The above is a real scenario from in game and I love to be in a real world where what you do effects things. Yes you still have to kill things as latex seems to dislike but to do so in a storied and real setting as opposed to static path following mobs is great. I like to be drawn in to a real game world and this game does it better than any other out there.
I can see why some people dislike it as its different from the norm, challenging and is, ultimately, pvp focused at endgame. But by the same token there is no way it can be classified as a bad game, not your tase? (Not you who I'm replying too, just generalising

) certainly, bad game? No.