Star Wars - (A+) My favorite movie of all-time, and should never be lumped in to some 6 movie saga Lucas is trying to do now, because the movie is totally taken out of context by new fans. The movie has great characters, great drama, great humor, great action, and great music by John Williams. As much as people bash Lucas on the PT, this one is his baby, and it is one of the alltime greats.
Empire Strikes Back - (A+) In many ways a better movie then Star Wars, simply because of the budget and the fact that everything is setup so you can go right into the heart of the story. Because of Kershner, the movie has that edge to it as this is the best acted of the 6 movies, and essentially the most dramatic. The music again is top notch and new characters like Yoda and Lando already add to the SW lore. Once Han/Leia arrive on Cloud City, that is probably the best 45 minutes put on screen I have ever seen in a movie. Oh year, "I am your father." I guess I don't even need to explain the impact of that statement.
Return of the Jedi - (B) The movie has some of the greatest moments of the 6 movies, but it saddles with lulls on Endor in the Ewok village, and Jabbas palace part that goes on too long. The Throne Room Scenes are as good as it gets in a SW movie, and Luke kicking everyones ass on the Sailbarge is great too. The Ewoks and kiddy tone hurt the movie, but all in all a pretty good ending to a great trilogy.
Revenge of the Sith - (C+) I call this Return of the Jedi-lite as it has great moments but is really marred by terrible moments. The opening shot of ObiWan/Anakin going into the huge battle with the drums beating is pure SW. The Padme/Anakin scene where they stare at each other on Coruscant with that eerie music is a classic scene. But the whole turn scene is so contrived and doesn't make a lick of sense as Anakin starts going on a killing spree really hurts the movie, let alone the trilogy. The ending has great moments with Baby Luke at the end and Leia going to Alderran, but again is marred by Vader saying NOOOO!
Attack of the Clones (C) This movie gets alot of crap, mostly for the romance, which is a fair criticism, but it is only 10 minutes of the movie total, so there is only 10 minutes of shit:) I do like Obiwan in this movie, and I like when he goes to Kamino to oversee the Clones, as that foreshadowing is very good in the context of the OT. The Clone Wars are action packed, and the Dooku duel is fun, as this is just a pure action SW movie, and taken in that context, it aint that bad.
The Phantom Menace (D) The only reason I give it a D, is it is still SW, so I can find some enjoyment to it. I never liked this one from the day I saw it in 1999, as I hate Jar Jar, I hate Jake Lloyd, I think Padme being monotone is borrrring, and the kiddy tone is worst then Return of the Jedi. The Lightsaber duel at the end and the Senate scenes are the only worthwhile thing of this movie, oh and Liam Neeson is good too. Lucas made this TOO much of a setup movie, as Attack of the Clones could have really been Episode I.
All in all, these grades are graded on a SW scale, as if you asked me in a movie sense, I would only say that Star Wars & Empire are the only great movies of the 6, and the rest are only liked by SW fans.