I don't want the community features, and don't want Steam running in the background (and don't want the overlay)... Absolutely none of that has anything to do with the game that I bought; Its adds nothing, but a resource drain and an open server for a singleplayer game.
I paid for the game, not it's parasite.
Dude, Steam uses 8mb of your RAM. Is that really a big difference? Also, you CAN disable the steam community in game, which probably makes it less of a drain on your memory when you are in game. You can disable Steam from even signing into the community portion of the program. You can disable any and all notifications. You don't want friends, or have the community features? Don't use them. You don't have to visit any page in Steam except your library if you don't want to. You don't have to even visit the store page. Hell you don't even have to have steam running, except when playing a game that requires it.
Really, I think you are just arguing for the sake of arguing. This isn't 2002, and 8 megabytes isn't a big drain, nor would I classify it as
parasitic. That's a bit of a stretch.
EDIT: And let us not forget the grandaddy of all things great about Steam. The sales. Throughout the entire year, they have many different forms of sales. During these, you can pick up games for RIDICULOUSLY low prices. Right now, for example? STALKER bundle is 9.99. DOW2 bundle is 19.99. DOW bundle is 14.99. Its just about to be November folks, the sales are only going to get bigger and better. The Christmas/New Years sale is just..... well. You will see. It blew me away last year, and surely it will only be better this year. Probably bought 15 games, for around 60 bucks and these weren't 10+ year old games.
When it all comes down to it, the pros vastly outweigh the cons.