Away from WWII, it brings innovation
First lets start off with the basics. The graphics are awesome, and they look good in motion. Sound is crisp, and voice acting is spot on, along with battle shouts and ambent sounds. The guns sound realistic along with explosions.
Now for gameplay, it brings a really nice experience to the FPS genre, motions are fast along with smart NPCs and frendlies, along with putting in the ocasional pice of intel here and there. An overall fun experience. It also introduces shooting throuh walls, a feature not sown before in FPSs that adds a new line of thought to where youhide, instead of just sucking for cover.
Multiplayer is worth it, unlike some other ranking systems, your rank is based on the amount of kills you get, and with one extremely small glitch, works. Experience points are acquired another way also, kinda like goals there are challanges that require you to do certain things, like shooting an amount of kills prone and things like that.
Overall, it is a well balanced game with features that make it stand out.