all the arguments so far are easily refuted:
1). I don't like auto patching!
Answer: turn off auto patching
Apparently broken. Still auto-patches even when turned off. Will always auto-patch if you reinstall the game.
2). I have to be online to play my games!
Answer: go in offline mode, you only have to be online for initial activation
And patching. And every three weeks to update Steam, apparently.
3). I have an unwanted program running on my computer!
Answer: Create a steam group about how much you hate steam, that way you use the program so its no longer unwanted and you have fellow steam haters to talk to
Using it to complain doesn't make it wanted, just makes it used.
4). If steam goes down I lose all my games forever!
Answer: Not if they are already installed on your hdd, also steam has been steadily growing over the last few years, it is more likely pc gaming dies as a whole than steam itself goes under.
This still relies on Valve releasing modified versions of all the games that don't require Steam authentication. Some people don't trust companies in this manner.
They are all valid complaints. Bethesda clearly thinks the benefits (probably to them, not to the consumer) are worth the risk, but it doesn't make the complaints invalid.
Mind you, one and two are complaints that should be addressed to Valve, and four is entirely theoretical.