Cant honestly think of under rated games. I would say the older MMOs like UO, EQ, and DAoC but they arent under rated as anyone whos been gaming long enough knows how great they were. Maybe under rated in the sense these n00b generation of gamers only compare everything to WoW and thus older games suck to them. Also was gonna say a lot of games by MicroProse but again anyone thats been playing PC games for a long time knows they are probably the best gaming company in history and put out a ton of great games that again no one today has probably played. Their combat flight simulator games were just great and a lot of fun to play and of course civ I and II and MOO and Mech Commander.