The power of the prequels is, to me, the emotion and the drama. The character interactions, the slow dialogue. But then I am a sucker for soap operas. I can’t help it. To me they give a depth to the saga that it wouldn’t have otherwise.
Are they all good as films though? Hell no. I would say Phantom Menace is the only one that is actually a brilliantly made film. In terms of pacing (the theatrical version in particular), iconic shots and atmosphere. It is my favorite Star Wars film together with Return of the Jedi.
Attack of the Clones is a boring slog to watch IMO. Revenge is the Sith is a wonderful powerful drama unfolding to the viewer, but in terms of film falls short. It sometimes feels more like episodes of a TV series cut together into a film-length experience.
In the end I do enjoy both Menace and Sith, but it is only the first one I consider good.