Look, I really don't know if the laptop version, gt 520m is better or if the drivers were too young at the time of that review, but I'm writing from my own experience, also if you wish, there are a lot of youtube videos showing the performance of that card.
As I said, Modern Warfare 3 is not a demanding game, most console ports aren't. I could make a list of many games of this generation I can run on high or maxed out graphics, but again, you could check on youtube.
As for GTA IV and Max Payne 3, I dont know, Rockstar is known for being horrible at porting and optimizing their games, so it's probable they won't run well.
I can tell you about MW3, because I own the game and didn't even bothered to install it on my desktop computer, a quad core with a GTX 560 ti. Because on my laptop It was already on max settings and I could play it on the go.
Also, for the record, Rage runs at 60 fps and never drops.
Only game I couldn't play on my laptop so far was Witcher 2.