So, a small technical issue: do you mean "nobody in my gaming group," or "nobody I know," because I'm pretty sure Blacksteel and Barking Alien would play Champions with me, even though no one in my gaming group in Kansas would.
So a game I like that few other people do. I love Cosmic Enforcers, but I think most people don't even know that game.
It's got a fun "Legion of Superheroes" thing with futuristic alien superheroes battling crime and galaxy-threatening alien conquerors. Rules are sketchy and unbalanced, if that's a problem for you. I actually corresponded with one of the creators of the game, who basically told me he wouldn't communicate in any manner regarding the game because the publishers had hosed him, which is too bad.