I'll start on a couple of positive notes.
There are two good things about this movie:
1) It's in color, and
2) It ended.
I'd say about 33% of this film is people being held at gunpoint, 33% is people being shot in the head, and the final third is people yelling at each other.
There's one long stretch with Heinrich Himmler (who here looks like a dead ringer for Hitler, which he wasn't in real life) heading up a meeting of 10 or so old Nazis (all speaking German so you have to read the subtitles throughout, whereas it would have been a good place for them to just slip into English with a German accent.
There's a long opening scene in which, after the Americans' bomber crashes near the "front lines" in France but most of the crew survives, a really bad SS guy (you'll recognize him from one of the Mummy movies) shows up, holds the crew at gunpoint, then eventually shoots all of them in the head just for giggles. It sets the thematic tone for the whole movie.
And did I mention poor acting throughout the film? Yeah, it's there and it's pretty consistent.
I dunno - maybe 2 stars is a bit generous for this one.