The two main things that made AOTC "bad" in the public's eye: 1) Poor acting and dialogue. 2) Bad screenplay. I think the 1 and 2 are related. Without a good screenplay even the best actors/actresses will be hard pressed to bring out a good performance. I admit, a lot of the lines in AOTC were cheesy, particularly the love scenes. But in addition to the dialogue, the love story was built up poorly as well. We go from Padme shutting down Anakin by saying, "No, I should not have done that" to suddenly, "I've been dying a little bit each day since you left my life."