bkev said:
1. The Phantom Menace. I'm not convinced this one totally sucks yet; the Phantom Edit did a good number on it.
2. Attack of the Clones, or Snore Wars. I never liked this one. Saw it twice in theaters, have no desire to see it again.
3. Revenge of the Sith. This came out when I was in 6th grade, and I thought it was... well, okay. Saw it with my dad while vacationing in Lanai, which is a good memory associated with it. Haven't seen it in full since.
So basically #2 and #3 are the ones I'd say really suck; 2 I knew right away, and 3 is in retrospect.
I'm guessing you haven't seen the Plinkett reviews.