Steam is all about giving Valve total control over their game on your machine. They have the power to update it, lock it, delete it, fuck it up completely, make their files grow until you run out of disk space and if it's your system disk you may end up screwed because your machine won't reboot.

If Steam doesn't die the horrible death it deserves then I think more and more people will switch to consoles for gaming. I use my computer for more than just games and I value my security and don't trust any software house enough to give them a back door onto 'MY' computer.