First, the short list, or, the things I liked:
1.) Everything associated with the Darth Vader suit. It was neat to see Anikan put in the Vader suit, and hearing the voice of James Earl Jones instead of Hayden's.
2.) The ending sequence was nicely done with the classic scene on Tatoonie with its two suns.
3.) The cancelling out of force push between Anikan and Obiwan.
4.) I enjoyed the symbolism of Yoda vs. Palpatine in the Senate room, and how Palpatine threw the Senate seats at Yoda.
5.) The irony of Anikan trying to save Padme, but in fact moves closer to killing her.
Now the much longer list of things I didn't like:
1.) The opening crawl made me laugh.
"War! The Republic is crumbling under attacks by the ruthless Sith Lord, Count Dooku. There are heroes on both sides. Evil is everywhere."
Dun dun dun!
2.) There is a force field blocking a ship hangar, and the shield generator happens to be right next to the force field for Anikan to shoot. I'm sure if I designed a space ship, I would put the generator right next to the actual shield.
3.) When in the space ship, we get to hear such great dialogue as:
"Get help! You're no match for him. He's a Sith Lord."
"You won't get away this time, Dooku!"
"Wait a minute, how'd this happen! We're smarter than this."
4.) Half way through the movie, Mace Windu makes the statement:
"I sense a plot to destroy the Jedi. The dark side of the Force surrounds the Chancellor. "
Very good, Mace Windu. Glad to see you and the other Jedi are in tune with the current events. It's nice to know that you Jedi Masters can sense the death of another Jedi a planet away, but it takes you two and a half movies to discover that Senator Palpatine, walking right next to you, is THE Sith Lord, and he wants to kill you.
5.) Jedi, aren't they suppose to be able to sense what is about to happen and be aware of the people around them? If this is so, why was just about every one of them killed so easily by their comrades in battle? The Jedi were able to fight off large amounts of enemies as shown in Episode II, but because the plot needed them to die, they died.
6.) Senator Palpatine is able to kill three Jedi with a few swings, which wouldn't be as bad if we had not seen the same Jedi fight so well, in the last movie, against hundreds of enemies.
7.) The saber battles were zoomed in so close I couldn't tell what was going on. You might say, "It makes things more intense!" What, so you're telling me it wasn't at all intense when, in Return of the Jedi, Luke is fighting Vader and I can see where the sabers are hitting? You're telling me it wasn't at all intense when Darth Maul stabbed Quigon and Obi runs out, kicks his butt, and we can see what is happening? To me, zooming in for almost the entire time is a cheap way of making a lightsaber battle longer with more blande choreography. This is the only Star Wars movie where every saber battle was done in this style, which makes it even more dissapointing. This is, however, only a minor problem as I'm probably the only one in a hundred that noticed it.
Overall, I felt let down by Episode 3. I didn't expect it to be better than 4-6, but I didn't expect to be worse than 1 and 2. The most annoying part about the whole film was the horrendous script. Everyone on the cast has some acting talent, but they do not have a whole lot with which to work. This is especially true for Hayden, who seems to get stuck with the worst lines in both Episode II and III.