The Gamefly Crew is working hard to make Mac games available for purchase and for Unlimited PC play. If all you want are Mac games to play, I would suggest cancelling your subscription as Darkfang114 said and keeping an eye on the availability of Mac games. Keep in mind, not all Mac games that will come out are going to be free, and most will be olders games and not popular recent ones.
Well... Oblivion was really good, but it wasn't a captivating game you know? It had lots of great potential and good gameplay, just not enough length and awesome story like skyrim. Or challenge. Skyrim is amazing with amazing story and fighting, incredible length, and no matter how good I think I am, I still fight bandits that are insanely hard, and discovered a new dragon "Elder Dragons" that are way harder than normal ones.
For one thing, the Mass Effect series is now on ps3. I love halo, although I think that Uncharted, Resistance, LittleBigPlanet, Ratchet and Clank, InFamous, and God of War are much better than Halo and Gears. We recently lost Metal Gear Solid to 360, and 360 lost mass Effect.
I rented Rage from RedBox, because I had pre-ordered it and wanted to make sure it was worth it. It is worse than Fallout 3/ New Vegas in my opinion, mostly because I love those two games. The game seems very fun, I just didn't think it was worth 60 dollars, genius storyline by the way, look it up. I would rent it, not buy it.