Plus you got Tomb Raider and Bioshock Inf. that just came out ... Trying to get Tomb Raider to Wine as we speak I have little hope of Bioshock working... Oh well when you get the games for free.
1. the novelty worn off
2. only people with nvidia cards are able to properly play games (bla bla bla stfu, everyone knows amd and intel perf suck in linux)
3. windows users who just wanted to get the penguin for free
4. old old old games, I mean OLD games that I played when I was a kid, cs etc
My Steam list in Linux is very short compared to my Windows list... I've bought a lot of Linux-friendly indie games in the bundle sales - but the replay value is lower compared to the likes of S.T.A.L.K.E.R. or the Half-Life 2 series... qed
I would fire up Steam under Linux if I could play Black Mesa Source and HL2 (+episodes), etc. :(
I've got a radeon 6850 w/ r600g on a phenom II x6 1055t, and TF2 runs just fine on my machine (at 1920x1200). Most of the other games I've got installed are less demanding than that. But then, the most graphically intensive games I own are GS:GO, BF:BC2, Borderlands 1, or GRID. I have a suspicion that half of those games would perform acceptably if released in Linux w/ OpenGL.
My biggest problem at the moment is actually Skype. I get some nasty audio distortion on my system when I use Skype for voice chat, which prevents me from using it during my TF2 sessions.
The top shelf games they are porting are mostly old titles that the essence has all but dried up in. New games should be new releases.
The problem is game developers need solid standards for graphics and sound. You either do this with wrappers, or the distributors need to concrete standard in with modern able drivers and routines. Ubuntu's Mir maybe the preferred choice for developers coming from other platforms.
r600g is a pretty good driver.
I think these linux numbers just reflect that many of the games that folks want to play havent been ported yet. In addition alot of the rounding is to 0.00% which counts as nothing. Even so it couldn't be more than a quarter percent off tho, so not a real big deal.
7870 and 6550 both play all the games I own for steam flawless.
My Nvidia card (GT 520) plays without problems as well.
I think most people say the Linux driver situation is bad because they think about times passed.