Bit-Tech has a nice article on some of the best games you've probably never played. The list ranges from various years and platforms. I admit I didn't try out many on the list but the one that I did, Outcast, was loads of fun. I remember this was one of the last games I saw at E3 many years ago and it blew me away. I had the pleasure of reviewing the game many many years ago and even got a nice email from one of the people behind the game saying I was one of the few that got the story. Good times, good times.