@Wizard of thay
I can't see the step forward.
The same troubles as Windows Life with a buggy steam release at the start (Dr. with rolling head, steam community features breaks the game, ...)
Steam Anti Piracy had not the desired effect only a two hours after release

.
The game was cheaper to buy in the shop for me as at steam.
Windows Live could be completely disabled if you wanted to. There is no official way to get rid of steam.
You are not able to resale PC versions (XBOX and PS3 without steam can be)
And to get on topic again patches aren't delivered faster with steam as was told by most of the steam fans.
No advantages, only another unwanted spying Adware on my PC.