I've already seen it -- it's very well done, but it's not necessarily a masterpiece. Imagine the first 20 minutes of SPR but scattered throughout the whole entire movie. It's intense, very realstic, VERY graphic (I had to turn my head a couple of times), but that's just about it. Nothing but lots of shooting and people yelling "F***!! Lookout -- RPG!!!" The performances are fine, the technical aspects are top notch, but I think it's weakest element is the script. It's lacking the human element that I thought made SPR such an outstanding movie. It has too many characters without much depth to keep track of.
Fortunately, though, it's not a "RAH RAH RAH America" Bruckheimer pic. The characters, while somewhat shallow, do some very heroic things, but at least they act with a large degree of realism.
Of course, IMHO. 🙂