I have it, but have had zero time to play it. I've been so busy with work, school, and family lately. I think that all I have done is the tutorial and a mission the day I bought it.
I enjoyed GRAW 1 a bunch, and GRAW 2 adds some new support equipment and the full-size embed camera, or whatever they call it, so you can see the view from all your support elements and still give commands. It should really be called GRAW 1.5, because it isn't totally new. There are more multiplayer modes, a built-in clan tools, and the graphics have been improved a little. The smoke effects and explosions are pretty awesome. If you liked the first one you'll really like this one. They changed the classes a little - you can now be a marksmen - and they added or increased the effect of class bonuses. The weapon choices in MP are awesome too - quite a selection, with great sounds.
I wish it used the cover system from R6:Vegas though. The whole "sticky" cover thing is a pain.