Not big ones, mind you...I guess they'd count as minor annoyances
1) Static mobs
Monsters that move around their spawn have been around MMOs since 1997, mobs in SWTOR dont have even an idle animation, they are basically statues. (apart from random mob here and there that tend to do perfect circles or prance back and forth)
2) Reuse of graphical assets
Both Imperial and Republic space station are the same, just reskinned. All starports are the same, just reskinned, there are 1-3 types of buildings per planet. Most instances share same decorations. Only things unique to all planets is the landscape.
3)NPCs saying same things over and over when you pass by them
AHH ELDER SCROLLS FLASHBACKS AHHHHH!!!