Yes. I noticed the different system requirements on Steam... Not sure if I can run the games at decent setting on my late 2012 iMac.
I snagged both games yesterday. Couldn't resist! Metro 2033 is LITERALLY a slideshow. Haven't tried Last Light yet.
I'm not giving up on it yet, but I also have a late 2012 iMac, and it's so far unplayable.
I'll let you know if I have any positive news.
Also, did anyone else notice the video options in 2033's options?? Despite being VERY limited in things the game lets you tweak (compared to Windows), it has a checkbox for PhysX.
Hmmmm.....ever the optimist for hardware accelerated PhysX in OS X.