I can't get over the fact that they removed everything that made Guild Wars great. GW2 is a good game in its own rights, it just has nothing to do with GW aside from the World and some easter eggs here and there.
Also, I despise the combat and the zones, while beautiful, are boring honestly. And last nail in the coffin, deciding to use conquest for the main PvP mode while never really bringing GvG (which they promised they would). I just don't trust Anet at all. They spit on the GW community, and everytime I play GW2, I wonder what it could have been if they made a true follow-up to GW with that engine.