The Steam client and each game are different applications and may have different requirements. So, it would be nice to know which particular games you are having trouble with. It might be even better to check out those games' forums directly. If some of those games don't have their own Compatibility entry, then this forum might be the best place to discuss it, at least until the entry gets created.
So, to recap: which games? And have you checked their own forums?
We're rebels. We're misfits. But mostly, we're software liberators. And we're very, very good at what we do. We have to be. Lots of developers work with open source, but only a tiny fraction of those are good enough to get software that was designed for one platform to work on another one. We invented CrossOver software - a unique approach to cross-platform compatibility that does not require dual-boot or another OS license. We launched PortJump to help app and game developers broaden their market beyond Windows® users. And we launched ExecMode to help organizations solve really ugly technical challenges.