Yes I have.
Ones I've fixed after quite a bit of fiddling: Skyrim, New Vegas, XCOM, Magicka
Ones I still can't get working: Magicka Wizard Wars, Just Cause 2, and Strike Suit Zero (It doesn't like my video card apparently)
Oh and Nexuiz for a different reason that steam *still* owes me a refund for. When they pulled it from their market it disabled the game for playing much like Dark Spore (which I didn't buy just read about). But the game still works, it just won't run because of steam.
Ones I've fixed after quite a bit of fiddling: Skyrim, New Vegas, XCOM, Magicka
Ones I still can't get working: Magicka Wizard Wars, Just Cause 2, and Strike Suit Zero (It doesn't like my video card apparently)
Oh and Nexuiz for a different reason that steam *still* owes me a refund for. When they pulled it from their market it disabled the game for playing much like Dark Spore (which I didn't buy just read about). But the game still works, it just won't run because of steam.