Inspired by hrabb04's STAR TREK movies thread:
STAR WARS (sorry, I refuse to call it A NEW HOPE) - the best of the series. Enough said.
THE EMPIRE STRIKES BACK - vastly overrated. The scenes on Hoth go on far too long, and there's too much gloom and doom throughout. Worth it for Yoda, though.
RETURN OF THE JEDI - mediocre end to the first trilogy, but fun if you're in the right mood. As with EMPIRE's Yoda, we have a creature who steals the show - Jabba the Hutt. Harrison Ford has great fun as Han Solo.
STAR WARS EPISODE I: THE PHANTOM MENACE - underappreciated beginning to the saga. Jake Lloyd and Jar Jar Binks let the side down a bit, but the script, score and effects are all excellent. Wonderful new creatures (check out the guy who has problems getting started at the pod race), and an awesome villain in Darth Maul.
STAR WARS EPISODE II: ATTACK OF THE CLONES - second best of the series. Thought-provoking script, fine performances, and some of the most imaginative design and effects ever seen.

Star Wars:Despite being the lowest budgeted film in series, it's the most artisticly complete film; it works as a stand alone film or as a sandwhiched episode between III and IV.

Star Wars V: The best film in the series. The most atmospheric and boldly dramatic.Vader was at his best. I love that Empire was not a retread of the first, the same reason I love Temple of Doom.Unfortunately, Lucas does a redo in ROTJ and Last Crusade.
:***: Star Wars VI:I love the Emperor and Jabba the Hutt. I feel sorry for first time viewers who will have already seen a CGI Jabba twice...a terrible move since the mystery of Jabba was carried over from the first film(IV). The Ewoks are a major liability and yet another Death Star assault feels unfresh. Still, it's a decent act three despite flaws. I hated Vader's pumkin shaped face. I wish we never saw it.Han Solo was dull too.

Star Wars I: I don't know where to start: Gungans, Jar Jar, Jake Lloyd, the mother....what a disaster...at least Darth Maul was cool.

Star Wars II: Anakin is a horribly realized character; he's annoying and a serial killer.Yuck. The
romance is cringe inducing. Too much CGI in this...a huge letdown.
Star Wars III: It has to be the best prequel. It just has to!