Whether you loved/hated Episode III, everyone can acknowledge that things could have been done to make it better.
1) Less reliance on Special Effects. The effects were great in this movie but the movie seemed to RELY on them, not use them to enhance the movie. The main pet peeve I have with that is that the lightsaber fights were too zoomed in and effect-ed up. You can't see the fight very well. Episode I had the best blend of effects/real-life in my opinion. It was very futuristic looking but still looked REAL, something I cannot say about Episodes II and III. Episode I had the perfect zoom level for the light saber fights as well.
2) Some of the dialogue, of course, was cheesy and stupid. You'll have that.
3) The Yoda line about how Qui Gon could communicate or whatever, pointless.
4) The beginning of the movie was like pure slapstick. That was really odd and didn't seem to fit the Star Wars theme.
== SO here is a question...
Mace beats down Sidious, Sidious beats down Yoda
Anakin beats down Dooku, Dooku beats down Yoda
Whats up with Yoda? haha
Also, as far as all this nonsense about recognizing droids, you have to remember that we are constantly seeing them throughout the story via A CAMERA. The main characters see them FAR LESS than we do and we are seeing a few main events throughout their lives that are YEARS long. Plus, all droids look the same and Obi Wan would be more likely to recognize his astro-droid, R4.