Outside of these forums I hardly ever hear people talk about games that we talk about here often. Okami, The Darkness, Darksiders, SotC and Ico, Jade Empire, No More Heroes, Mirror's Edge... When I mention these to people it's almost always the first they've heard of them. Sometimes they will of heard of one or two of those, but there's always plenty they've never heard of.
Within these forums there isn't really much. I guess Muramasa doesn't get mentioned that much, but what is there to say about it? I'd love to have discussions about it but I wouldn't know what to talk about. It seems like the kind of thing that would come up on these forums a lot though. People here like similar stuff.
I guess Stubbs the Zombie is another. Nobody mentions that, and I have no idea why. Maybe it came too early, before the huge rise in popularity of zombie games. But it deserves to be spoken about. It's really quirky and hilarious. It's a real oddity, especially for when it came out. I guess the fact it was an Xbox exclusive didn't help it much either. Unless it was Halo or Forza none of the 1st party original Xbox exclusives got any attention.
I'd really like to hear what anyone else has to say about their experiences with those games, if they've had any.
EDIT: Just thought of another! Mini Ninjas! I don't personally own the game any more but I really enjoyed that. It wasn't very complicated, it was clearly a kids game, but it was really well done. It was beautiful and charming and just damn fun. You could tell a lot of love went in to making it. It's design has kind of an old school feel to it too, but not in an obtuse way. I was so sad to hear the sequel was a crappy Kinect mini game. I would have loved a proper sequel. If anyone here feels burnt out on super serious games which require huge time and effort investments and just want something to relax with then they should really give it a try. It's really cheap now, and you can even try out the first few levels for free in Chrome too.