They are atrocious pieces of shit, because of the writing. Plenty of scourging reviews have been written for them, but by far the best ones are the Red Letter Media video reviews:
http://redlettermedia.com/plinkett/star-wars/star-wars-episode-1-the-phantom-menace/
http://redlettermedia.com/plinkett/star-wars/star-wars-episode-ii-attack-of-the-clones/
http://redlettermedia.com/plinkett/star-wars/star-wars-episode-iii-revenge-of-the-sith/
They basically explain and detail everything about why the movies were written atrociously, executed poorly, marketed excessively, and so forth. Anything I could say about the prequels has already been said in these 3 reviews.
http://redlettermedia.com/plinkett/star-wars/star-wars-episode-1-the-phantom-menace/
http://redlettermedia.com/plinkett/star-wars/star-wars-episode-ii-attack-of-the-clones/
http://redlettermedia.com/plinkett/star-wars/star-wars-episode-iii-revenge-of-the-sith/
They basically explain and detail everything about why the movies were written atrociously, executed poorly, marketed excessively, and so forth. Anything I could say about the prequels has already been said in these 3 reviews.