Yes, I do use it some, as I do sometimes play TF2, and I barely tolerate that steam junk for Valves own games. most of the things you bring up as improvements are fluff or obviousness, lets see, steam is mainly meant for multi-player games, not single-player like the Civ series.. so for a shooter of course you want a friends-list so you know when your team-mates are online.. group chat? just what you find in any IM client, nothing special. in-game layer system, that window at shift-tab? not really usefull. groups, what is this? facebook. (ok, its for Clans, another shooter game mainly feature). Gifts, its a webstore, duh, ofcourse it got gifting options, so do amazon.co.uk nothing new. Demos, is that new? come on, Demos have existed for ages, we had demos last CENTURY..

(only 10/11 years since that happened, hope you got the joke). Free games, they exist outside steam too. Cross-Platform PC/Mac, one more that panders games to a OS made to make pretty pictures for adds, newspapers, making and editing videos and no other functions. (Joke about Macs, they can do moore).