What is your Favorite PC game and Why???

Big rigs

Diablo and Diablo II, Neverwinter Nights and World of Warcraft.
Why? You can play them over and over again and never get bored.

Replying to #102

I played Diablo II for a couple of hours and was bored. There are way better hack n slashes IMO. As for WoW, I was bored after 10 minutes but continued playing for a couple of days to humour a friend, never got fun.