I used to love war movies. Now, not so much. Dr. Strangelove is brilliant, The Thin Red Line is a poetic and awfully pretty (in terms of how it's shot) war film, Saving Private Ryan was awesome and had a great sense of ambiguity about war until that fucking scene where the German prisoner they let go comes back and kills the Jewish guy - that was one of the poorest plot choices I can think of pretty much ever and it totally undermined a lot of what made the movie interesting. Lets see.....those two Eastwood movies, I thought, were pretty terrible. I felt they were pandering and, in many cases, overly choreographed. I'm not a fan of Platoon or Full Metal Jacket either. I dunno why but nothing really clicks for me when I'm watching those. Of course, they weren't as bad as, say, We Were Soldiers or Windtalkers. I did like Three Kings though. As far as the genre goes, I tend to prefer to comedic war films like the aforementioned Dr. Strangelove, MASH, Good Morning Vietnam, Tropic Thunder and so on. A compelling war movie is hard to make since it's so easy to fall back on the merits of pandering to patriotism and indulging in ultraviolence.
All those old B war movies the op mentioned sound awesome though. I love stuff like that.