To the point:
Refusing to fix the hundreds of bugs
Tons of Specialty Vendors (Yes MMO's all have these but not this many in less than a year)
Rakghoul event was terribly thought out
Horrible class balance in PvP
Lack of end game
Healers have 3 buttons
Removed content (Mounts, crystals, gear set pieces, etc)
Bioware/EA should have never even attempted to make an MMO. If this didn't have the Star Wars label attached, it would have already been in the bargain bin next to Rift.
P.S. You can have your free month back, I shan't be needing it.