I am hesitant to purchase anything else from Steam because, thus far, I have not enjoyed the games I have purchased from Steam. The last two games I got were Morrowind ad Deus Ex and I disliked both of them so much I uninstalled them.
So I've been trying some of the demos for other games I have been curious about. Fahrenheit was trial and error gameplay with piss-poor mouse-based Wiimote waggling and, therefore, can go fuck itself. Prince of Persia Sands of Time was a platform game with a lot of convoluted acrobatics that are nigh-impossible to execute with the controls. And Painkiller which seems to be a decent enough FPS even though it seems like the enemies are a bit to resistant to projectiles for my taste. Of these, Painkiller seems to be the most worthwhile, but not enough to buy and Fahrenheit can go fuck itself.
I have been hemming and hawing about buying Beyond Good and Evil. I had rented it for the PS2 a year ago. I didn't finish it but I go as far as some boat race where I got stuck trying to figure out where to go and what to do. So it may the the fun stopped right there and I don't want to pay money to find out.