I just watch them again lately
I don't want to agree with you but fuck i'm close. Some dialogues are terribles, and even the little stories aren't that great (Anakin Padme has awful moments, Jarjar, Geonosis battle is average, the counsel issue and Palpatine/Analin was sometimes ridiculous etc).
The huge + of the Prequels is the big story : the lore, Palpat plan, Dooku, separatists, clones, Anakin downfall, Order 66 etc etc
The big picture is awesome, flesh out the universe a lot and has lots of hype moments.
But those films themselves aren't really amazing