Well, looking at the low playtimes, first thing I'd do is ask if you've played the console versions of any of those. --- Games I've played where you have non-consensual sex with your step-sister while half drowning her in a kitchen sink:1
that link should actually work better. A lot of games I have played on other platforms before building this rig. IE: Skyrim, Dishonored, Fallout: NV, etc. --- i7 3770k @ 4.5GHz  HIS IceQ X^2 7970 |1200|1600|3GB|  16GB Ripjaws Z 1866  ASRock Z77 Extreme4  250GB Samsung 840  2TB Barracuda  CX 600 PSU  H80i
You have Psychonauts with no play time, and Half-Life 2 with only .2 hours on it, which means it either didn't work, or you didn't like the first 12 minutes of it, so I'd suggest giving that one a try. And I haven't played System Shock 2 yet (been on my list since it came out, but I have a long backlog), but that one is supposed to be great, and you haven't played it yet either.
So Psychonauts, Half-Life 2, and System Shock 2. All games I either love or haven't played and just assume is great because everyone says it is. --- Every Pony is best Pony, Fluttershy is just my favorite. Do it and do it right!