TNT has basically been the only game I've been playing for about the past 9 months, with some blood bowl sprinkled here and there. It's simply a fun 'beer & pretzel'-type game that can be as easy or complicated as you like, and although fluff-wise it's "Not-Fallout", with games like these I prefer to invent my own fluff anyway. I also like that the game loans itself well to home-brewing crazy scenarios/monsters/equipment etc.