With my machine (and nonexistent budget for a better one) my main concern is getting games to run at a playable speed. Once it's playable, I couldn't give less of a shit how good it looks. I play Skyrim at 640x480 (big step up from 320x240 and still having severe lag on my old computer... now I can read the text!) with everything set to low. It's barely playable on my laptop, even at that res. I had to edit my SkyrimPrefs.ini and make it read-only so the launcher wouldn't override it for 800x600, you wouldn't think less than a couple hundred extra pixels would have that much of an impact, but it does.
It's the first "new" thing I've gotten in almost ten years. Everything else that could be classified as an electronic was used and old, and above all else, slow. Mom and Dad got this one for me when I headed into college this year, and they insisted upon the cheapest new one they could find. They went only with new simply because they were under the assumption that it would last me longer. Time has yet to tell, but I must say that this is a significant upgrade over my old computer, so I can't complain too much.
Macs make great gaming laptops if you install Windows on them and push the screen res down a bit. Those GTX 680 M's are more than competent. Much better than, say, Intel HD Graphics (not even a number) on a Celeron N2830. Honestly wishing I had went with one of the AMD-based models, the A series have integrated Radeons that beat the Intel HD's ass seven ways to Sunday. And you don't even have to go with their next-to-highest-end product for a quad-core!