I've been considering upgrading from snow leopard to mountain lion for a while, but from the things people have been saying, have been hesitant to do so. However it seems more and more games are running on either 10.7 or 10.8, a lot of which I want to play. I'm not too worried about the games made specifically for the newer OSes or from the App store, but I am worried that some of my steam games won't work on the newer OSes. Specifically Assassin's Creed 2 and brotherhood (which as it is are hard to get working and don't like running easily), the main valve games, shank 2, and the telltale games. I really only use my macbook pro for gaming, the internet, word, and imovie, and the only one of these that will be affected by upgrading would be gaming, but I don't want a lot of games I payed good money for to stop working after I upgrade. Can anyone shed any light on whether or not my fears of 10.8 are justified or just hype by the technology inept masses filling the internet with misguided complaints?