Here's my list from best to worst:
5
7
6
4
3
2
1
[spoiler]If you say one of the prequels is your favorite it's heresy.[/spoiler]
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I like the movies a lot, and I see something in the prequels that not many other people do. My order of favorites: 7 (new and fun, diverse, just great) 5 (AT-ATs, Lando/bespin, cool light saber fight) 3 (Phase 2 clones, obi vs anakin, Order 66) 6 (2nd Death Star, epic ending, but ewoks- ugh!) 4 (The original!, whiny Luke, bye Death Star) 2(pretty terrible, except clones!) 1(trash, except for duel of fates. Which was still kinda stupid)