MAG never really got my interest... Even though it's a great style game, I just simply do not like it. Modern Warfare 2 is just easier to play in, and though they made it "Noob Friendly" What's wrong with that? I still own every game I get into like an average of 4:1 k/d ratio. It just makes the game more level, and you shouldn't complain about it. I don't see anything wrong with MW2. There's a lot more customization in it, not too much to make the game confusing, but just enough.
I just don't like the FPS style of MAG. It's a good style, but some people don't like it. If MAG had MW2 style, it would be amazing in my opinion. But since it doesn't, I can't get use to the way you play it.
Overall, MW2 is probably the best game online I've played. It really gets your attention. Maybe it's just I've never really given MAG a chance.