1. Vader's "Noooooooooooooooooooooooooooooooooooo!" - Made me bust out laughing with tears flowing out of my eyes.
2. General Grievous - Dumb character, speaks with some backwoods European accent. I kept expecting him to say, "So LoneStar! We meet at last!"
3. Anakin is supposed to be a godly Jedi, yet we only see him behead an old man and pilot a crashing starship. Obi-Wan on the other hand takes on Greivous and kicks Anakin's butt.
4. People can fight on floating metal in the middle of a molten lava river and not die from massive heat? C'mon!
5. Hayden's acting was completely awful.
6. The Wookie battle was not needed. It was just there to provide some flashy CGI and to show Chewbacca for 5 seconds to the rabid fanboys.
7. The Palpatine rescue scene (first 20 minutes or so) was horrible. Enough with the slapstick/annoying trade robots. Must have been there for the kiddies. Ugh!!!
I could go on and on, but this was the worst of it.