I bought and installed GC2, and noticed my video card had died in a software complication. Before I got that fixed, I tried GC2 out on a friend's computer. My friend patched it, and said the updates were great. Now my card's fixed, I have my CDs and CD key back, and I can't update the game.
I thought GC2 *was* multiplayer. Oops. My friend forgot his e-mail, too. Oops...
I've never had a problem with CD-required games, or a significant problem with CD keys, but I didn't know what I was getting into with this one. I've never cared to find and use duplicate CDs or key cracks either. This is just too much work to get an update patch.