I still am hating on steam for:
a) steam startup is the biggest contributor to starting up any game I got on steam.
b) attempting to sell a steam account results in a ban. Well actually why the hell can't one sell their steam account in the first place.
Benefits:
No CDs. Yay.
Instant buying.
Sales.
Cloud Sync so I can uninstall games to conserve space until I want to play them again.
Does not inject rootkits for DRM. (EA games still do, but thats ok I pirate those)