After logging a bit of time into the MAG Beta I've come away with pretty good impression of it. Very different feel from the CoD or MW style of play and much more akin to Zipper's Socom formula. The controls have been very easy to use and the interface is pretty simple. Shooting mapped to R1, aiming to L1. R2 for primary grenades and L2 for secondary grenade/ gadgets. These can obviously be tweaked but I personally feel this is a perfect layout. 
 
I've heard people claim that because of the size of the maps you can wander and not run in to anyone. If this happens to you then you are obviously playing the game wrong. Especially in check point missions. If you stick with your squad and head to each checkpoint whether you are attacking or defending there is always a conflict to be had. The only downside is when you die, few people are using their Meds to revive downed players and you have to run back to the checkpoint after the respawn time is up. 
 
All in all I think it is extremely promising and has a good play style. Significantly more accessible than MW2 by design alone. So for those of us who have been too belittled by the several hous in CoD and MW where you have to suffer with inferior weapons and equipment before you can stand a chance, this game will scratch that itch without leaving you cursing at the tv (or others if you're mic'd). Check out the beta while it's running, you may be surprised.