phar said:
Kameo, Prey, Heavy Rain, Just Cause, Quake 4 and Doom 3 are ones that come to mind.. ill have another think
Heavy Rain was not underrated. It got like 8-9 out of 10 everywhere. Which I find ridiculous, considering it has no replay value and is only about 8 hours long. I'd say it's extremely overrated, because it should only cost about 20-30 dollars for the low amount of content, and it wasn't even very interesting.
OT: Metro 2033, all reviews complain about buggy gunplay, and poor stealth, but I've had no issues with the gunplay, and I like the stealth. I think it's great.
Also, Spellforce 2 is a very interesting RPG/RTS hybrid, but no one I've seen has ever even heard of it. (And it does have its fair share of glitches.)
Also, the Escape Velocity series is absolutely awesome, but seeing as how the first two games were Mac exclusive, the third being the only one released on Windows, I can see how they went primarily unnoticed. Also, you can get plug-ins for the third game to modify it into the first two, so you can "technically" play all three on Windows, but only through mods of the third.