What pissed me off in Fallout 2 was that most places looked too 'clean'. VC, NCR, Broken hills, hell even New Reno. Besides that, too many damn trees around. If i'm playing a post nuclear RPG then i don't expect too many of that crap. Fallout 1 had so much more 'atmosphere' in that regard. I don't care how they explain it (maybe the explosion at the oil rig caused some damage again) but get more wastelandish cities and places in. And get rid of the damn trees.