Janskeet said:
For me it was after the first 20 minuets of AOTC when I realized this prequel story was going to suck. When was it for you?

I was enjoying ep.1 in the theater, probably assuming it was great because it was Star Wars after all, until the "midichlorians" came up. At that moment, it all came tumbling down and I realized that the whole thing had actually been sucking.

The most universally obvious moment was in ep.2 when Anikan was calling out his mother's name in his sleep, and people in the theater started openly laughing.