Batman (1989): A decent kicking off point for the film franchise. The prince music gets annoying, Basinger screams too much and while I enjoy the psychotic aspect of Nicholson's Joker, the character still comes off as Nicholson playing himself. While I enjoy Keating's portrayal of a foppish Bruce Wayne, it's his Batman that kicks complete ass. While he doesn't have the fighting moves that is a guy that you would shit your pants at if you met him in an alley.
Batman Returns (1992): My favorite of the 89-97 live-action films despite the fact that Batman has too little screen-time. Keating's Batman is still awesome and Pfeiffer's Catwoman is the best portrayed villian of these series of films despite the nonsensical mystical origin. Devito's Penguin is overacted crap. Overall however the film still stands up well to me.
Batman: Mask of the Phantasm (1993): I love the 90's animated series and own all the DVD's. That said, I was also fortunate enough to see this film at the cheap theaters right before it disapeared and it remains my favorite Batman film. This to me is a true Batman film completely loyal to the character's comic origins despite the love story. A great film-noir plot, Kevin Conroy's Batman and Mark Hamil's excellent rendition of the Joker are just icing on the cake.
Edit: Just adding Shirley Walker's excellent opening theme for Batman: MOTP.
http://www.youtube.com/watch?v=8jQtIh1PCYA
Batman Forever (1995): Despite the return to obvious camp I enjoyed this film back when it came out. Then again I was 11. This was definately a pay check film for Val Kilmer as his performance of the Dark Knight was phoned in. Where the hell is the Batman that makes criminals shit their pants damnit? Jone's Two-Face was useless, Carrey's blantantly gay Riddler got old quick. O'Donnell's Robin was okay but I've never been a sidekick fan.
Batman and Robin (1997): Everything that people say is wrong with this film is absolutely correct. They get points for using the animated series origin and motivation for Mr. Freeze but that alone is incapable of saving this wreck.
Batman Begins (2005): A good film with a decent story. I especially enjoyed that they used two previously unused members of Batman's rouges gallery even if they did mess with Ra's Al Ghul's origins and kept mispronouncing the name. Bale's Bruce Wayne is an excellent rendition of the decadence of the character when he is putting on a show. That said his Batman, who has the moves, isn't nearly as effective as Keating's.
The Dark Knight (2008): An excellent Joker story with a large Batman subplot. While definately the best of the live-action films it feels like it would be better played as a cop vs villain story but I like the fact that Batman actually seems to do a little detective work in this film, something that all the films except Mask of the Phantasm lacked. Ledger's Joker is excellent as an obsessed homicidal maniac but I miss the overt psychotic aspects of the characer. Bale's Batman is better this time around but his Batman voice is damn awful.