I'll play...especially since I have some differing opinions...
Star Wars (A New Hope) - 9/10 (I know, it's the one that started it all, how can it not get all the points? Chalk it up to my love for the whole Death Star Escape sequence, and my feeling that the Yavin section at the end is kind of anticlimactic after all that. It's not an opinion I've heard from anyone else, but I've stopped watching after the Falcon/TIE duel many a time. Otherwise, obviously, just a great great movie.)
The Empire Strikes Back - 10/10 (The high water mark. The thing is so funky as a movie, it is striking (no pun intended) how refreshing a movie that doesn't follow formula can be. Can't turn it off once it's on, and always makes me want to put on...)
Return of the Jedi - 7/10 (when I was a kid this was my favorite, I loved everything about it, from Jabba to the Sarlaac battle (which I comitted to memory nearly shot-for-shot before VHS) to the Speeder Bikes and even the Ewoks. Nowadays, I wish it was a better movie and didn't rely so much o nthe characterization made in ESB, but did it's own stuff (Prime example, the ham-handed rehash of the "I love you" "I know" bit. It just doesn't work the second time, except to make you remember how good a scene it was the first time.) I still like the Ewoks though, if I skip something it is usually the Jabba's Palace beginning.)
The Phantom Menace - 8/10 (I am in the minority that thinks this was the best prequel. Even more so than ANH, this is a standalone movie to me. Qui-Gon Jinn may be the best-written character of the entire saga IMO. Watto is by far the best supporting character of the PT, and really is the villain of the flick, far overshadowing Darth Maul. Of course, then you also have Jar Jar and little Ani, but I can almost excuse that stuff because this boils down to a kids movie. I always get caught up in this one the whole way through, even through the Tatooine stuff in the middle.)
Attack of the Clones - 4/10 (I can't remember the last time I watched this movie, it had to have been pre-05, so more than five years. This thing just didn't work for me once the newness of its Star Warsiness wore off. Anakin comes off so much worse as a grown-up than he did as a kid, Obi-wan tries to save things but runs into plot obstacles that can't be acted around. The only interesting characters are the Lars family, and they get very short shrift. Nah, I'd pick TPM every time over this one.)
Revenge of the Sith - 5/10 (I appreciate the bridge back to the OT here, but there are just too many problems for me to really get excited about this. The quick-change of Anakin after all the soul-searching, the lumpiness of the plot, and the general feeling of mean-spiritedness and lack of joy really detract from my enjoyment. As a big R2 fan I used to really dig the opening sequence aboard Grievous's ship, but after 2 seasons of Clone Wars cartoons I've seen it done much better elsewhere by now. Now I'll watch it for the duel at the end, but that's about all.)