I am the same as SensiFan. I occassionally play games for nostalgia, but the effect has really worn off now.
I play games simply to experiance them, especially old arcade games which I never got a chance to play or cost too much money at the time.
At the moment I am emulating Marvel Vs Capcom. With a virtual $1 I can get all the way to the end boss! Then after another virtual $5 I gave up lol.
I just play whatever is good whether it be on 360, PS2, SNES, Arcade, Amiga whatever.