1) 'Follow the lighted path' feel. No open world feel. Walls, mountains and exhaustion zones abound.
2) Ability delays, should have never made it into the game.
3) Ridiculous amounts of CC, knock backs and pulls in PvP. PvP is just bad in general. Huttball is about who can make the best use of the environment, not about PvP. Voidstar is just who can zerg the same door over and over the best. Alderaan's probably the closest to PvP.