Wellllll with FFXIII i can understand, the first time I played nearly 50 hours and gave up, I still didn't have the mechanics down. Now that I'm at the exact same spot on the second playthrough I have a MUCH better understanding of the game, and I'm really enjoying it. It can be pretty tough at times.
I'm always down for Left 4 Dead 2 and I still play a few times a week, but I enjoy the expert campaigns and there are just too many noobs still out there, and I hate babysitting them.
And I just have to say Half-life was one of the best games EVAR