Sure. After I gave up on Mac Steam, I finally got around to splitting my primary partition 50/50 OS X and Windows 7, so that's where I do pretty much all of my gaming right now. But if I do end up trying it again later and find the experience not-terrible, I'll put the word in here.
I think the main source of wonkiness with the Mac client though is the fact that it was made in Adobe AIR, an app environment that was apparently discontinued on Linux almost a year ago. So if they're making a Linux client now, perhaps they're cobbling it together from scratch, which would greatly decrease the odds of similar awfulness, I would think.