The Phantom Menace - I remember repeating to my self "What the fuck is this" the whole time I've been in the movie theatre. I couldn't understand what's going on. Simply a lot of things happened and none of them left any emotional impact on me.
In other words, I didn't care about the characters. The only things I DID care about were - how will Amidala look when she gets bigger tits, when will Anakin and Jar Jar die, why does Liam Neeson look like a crappy actor, why is Yoda in the movie ?
I still don't understand that movie. Too many things are happening for no apparent reason. This movie needs a complete re-edit. Add a scene how did the Jedi get to Naboo, drop the Gungan city, add the waterfall sequence, drop the podrace, etc etc etc.
Attack Of The Clones - the only movie from the prequels which I REALLY like. It has many illogical parts, many plot holes, and the love story was way too long, but it was a fun action movie just like the original trilogy. I still like it.
The third one (I can't remember the title right now) - I would call it "colourful shit". I remember it was "red". The only SW movie I didn't buy on DVD. I remember only how I hated absolutely everything about this movie. Terrible script, terrible acting, terrible editing (where the f* are the rebellion scenes ?), terrible CGI ... and especially terribly written scene where Anakin turns into Darth Vader