I've tried Fallout 3. It installs fine, starts fine but the moment I actually try to you know...start a new game, it crashes halfway through the loading. I guess my system is just a tad too old for current gen stuff.
That said, I've been playing Mechwarrior 4 recently. In fact, I just finished the campaign a couple of hours ago. Now I love robots but to be honest, the Mechwarrior franchise doesn't seem to be my thing. It's good enough to waste a few hours on when you're bored and really need your GIANT ROBOTS!!! fix, but I just can't help but feel somewhat disapointed every time. The mecha are just too damn clunky and act more like a mobile fortress with a serious lack of firepower, than a hotshot state-of-the-art superweapon of the 31st century.
Every time I circlestrafe something for two fricking minutes, I can't help but wish I could use an Armored Core. It would make things so much more enjoyable, not to mention less painfull.
But you can't play Armored Core on a pc and I don't have a console anymore so...damn.