My Favoriute WWII Movie is "Twelve O'Clock High". The few Combat Sequences they have are spliced in with real footage, and sometimes it get s bit disjointed by my favorite thing about this movie isn't the Combat.
This Movie always reminds me of Wing Commander with the Character Development it goes through. I know that's a silly thing to say, but at least I'm saying it (this time) on Wing Commander Forums. I said it once somewhere else and developed a reputation as a raging lunatic.
The Movie's character development and plot focuses mostly on showing the burden of War on the men of the unit, and on their Commander. It talkes about, "the times that try men's souls" and men who push themselves to the limits to see just how far they can go, testing the very boundry of Human Determination and strength.
It's really quite remarkable, and while it's unfortunate that the movie is in Black and White, I wouldn't watch it any other way. Some people think it detracts from the experiance but I think it only enhances the movie. Maybe that's just me though....
That being said, I also like Battle of Britain. It's one of the most well done War Movies ever and shows very clearly the struggle of the early British Air Force to counter the Advancing German attacks.
A couple of others that are my favorites include "Father Goose" which is about a Civilian who gets conned into spending time on an island as an airplane observer, and ends up with a nun and a dozen Orphans to take care of.
And also, just for the sheer Comedy, "Operation Petticoat" which is about a Submarine that fights in WWII. At one point in the movie they torpedo a truck (the torpedo misses a boat and runs up a beach). In another they steal new supplies from an American Warehouse. And lastly, when they need sixteen gallons of paint to paint the submarine and they only have 8 red gallons and 8 white gallons, the Captain orders them to mix the two together to get enough Paint. I don't know if you can do the math...but the result is quite hilarious.
For other, more serious War Movies, "Das Boot" is very good, but only watchable when subtitled, really. "Hell is for Heroes" was also pretty good, I enjoyed it alot. And of course "Midway" which is the most fanstastic Naval Battle ever recorded on tape or DVD. "Midway" Always gets me, it's just such a fantastic movie.
Movies that are Crap, IMO:
U-571 (On an interesting note, there was a German U-Boat captured by American Forces whose designator was U-175).
Pearl Harbor (Obvioulsy NOT REALLY A WAR MOVIE)
Windtalkers (Nicholas Cage should stay away from trying to do Drama. This movie was a lame attempt to capitalize on the success of Saving Private Ryan)
Anyway, long post, but I hope someone can take something useful away from it.