A very good FPS, but it can be frustratingly hard at some points.
The story picks up from where GRAW ended. If you never played it, then #2 will fill you in pretty quickly. Its got your standard twists and turns, nothing insanely detailed or complex, but still very good. You'll find yourself creeping your way through enemy territory, which is very cool to see and pretty detailed. However, the places start to look similar after a while.
The gameplay is where GRAW 2 shines. It has an assortment of weapons to use, and you can customize your squad's arsenal too. This is a good feature to have, and helps when you need your squad to be perfectly armed. The game can be pretty challenging in the lower diffuculty, even the easiest will throw you off a couple times. However, it can be frustrating at a point. Keeping you squad alive can be a chore. They're smart.... Just not smart enough. You may find yourself messing with their orders a lot more than you'd like.
If you get shot twice in GRAW 2, you're going to die. Realism is used more in this PC version than in the console one. Bullets kill quickly and efficently, no matter what gun you use usually. Staying out of enemy sight is important, because their AI is usually pretty intelligent. They do some stupid stuff, but they are a challenge most of the time.
Overall, this is a great game. If you're looking for a challenging FPS that makes you think, then this game is for you.