I dont think bioshock for mac featured the dx10 water effects.
Black & white 2 port lacked some effects and options.
WoW always had limitations on osx and still have. It does not look the same as the windows version.
the whole dynamic shadow system for example looks different (more aggressive lod)
Not to mention dynamic shadows were initally unavailable because of Leopard openGL Limitations/bugs/whatever the issue was, and the other options had a inferior maximum view distance.
You cannot also have multisampling antialias while enabling the new water and sun effects.
During vanilla wow (osx tiger era), Bloom effects were disabled by default because it grinded to halt the framerate.
Don't get me wrong, I really love the developers efforts to bring games on os X, If you compare wow mac from the beggining (barely playble) to now, they really made the impossible.
And valve with portal 2 did an awesome job (very minimal performance impact).
I wish apple gave better open gl support for game developers. I love gaming on my macs (heck I'm still amazed by my imac, an all-in-one being good with games), I'm just tired of having crappy framerate because of osX
Back on topic now.
Rage works pretty decent on my 2008 imac (2duo 3ghz, 4gb ram, geforce 8800gs, lolvista 64) with default settings @ 1680x1050. Tomorrow I'm gonna try it on my mbp (late 11, 2,2ghz) and see how it runs over a cinema display.