Here's what I didn't like:
Digital "super-artoo".
If he had rocket boosters built into his legs, why the fuck did he need to be lifted into Luke's X-wing by crane? And the bit where he caught Obi-Wan's comlink really made me cringe.
Digital Yoda
Should be reported for false benefit claims - that's the most fraudulent use of a walking stick ever. Not only did the puppet Yoda look more convincing, it also didn't have such an annoying speech impediment either. Imagine the RotJ death scene; "Another... Skywalker... There... ... I s.". Fuck that shit.
Battle Droids
Might as well have had a big "off" switch on their backs for all the use they were. Just big piles of junk waiting to be lightsabred, not threatening at all.
General Grievous
Who?
That fucking lizard thing
OK I'll admit that Tauntauns in TESB looked a bit crap. But at least the scenes in which they appeared were kept to a minimum.
Chewbacca's appearance
What a fucking waste of time.
Anakin's turn to the dark side
If fear, hate and anger lead to the dark side, then it would make sense to cast an actor who can fucking act these emotions wouldn't it George?
Anakin/Padme romantic dialogue
*shudder*
Obi-Wan/Anakin fight
If they were such good friends, why didn't Obi-wan try and turn him back from the dark side?
Hayden in the Vader suit
Nope, just didn't work for me.