Well, it didn't take long for this series to wrap it up, after the "cliff hanger" of an ending for the last game. But to be perfectly honest, I have no clue what the story of the last game was about. Something about Irena, and then someone that betrayed us, probably Gabe. But I didn't quite see the connections in the plot, probably because I don't have the story of the first game down.
But other than the plot holes in my mind, and the obviously cheese for a plot of this game anyway, the actual gameplay is nothing new. It's basically an expansion pack for the last game, as nothing new is done and it just seems like more of the same. Granted, this and the last game are great at what they do, which is tactical, squad-based shooting.
Game Informer says it best. Something like "you don't stop eating your favorite food because it's the same." That's what you will feel like after you play this game. Tastes great, but it's nothing new.