#1: Too many bugs.
#2: Too many bugs never getting fixed.
#3: Tired of finishing the story for one class and then after creating a new character, having to do the same world quests all over again.
#4: End game was completely boring if you don't raid or PVP; (raiding sucks - my whole guild quit because of raiding....)
#5: Completion of most of the storylines sucked: Sith warrior is a decent fight, and that's it... The Sith Inquisitor's final fight is just black and white in difficulty compared to the other classes... Some of the class choices (like the Trooper) don't make sense for DSP and LSP.