First off... if you are expecting an experience similar to Modern Warfare, Forget it! Look elsewhere!
This game is very different than it's counterparts due to the fact that it strives for realism and tactical combat. However while this may be the games biggest draw... it's also it's biggest flaw.
The games attempts at realism sometimes backfire. While running from cover to cover, then siitting tight, afraid to poke your head up in case a round takes your head off may be more realistic than most shooters, it doesn't offer much entertainment value! The enemy are very good shots and you will spend a lot of time relying on your fire team removing enemy threats rather than taking care of them yourself (especially on Hardcore difficulty). Again, this removes part of the entertainment element.
The command system is also flawed, too often your orders will be ignored or your team will walk straight into the middle of a firefight and you will be left picking a command and hoping for the best!
On Hardcore mode, the game removes virtually all onscreen info. That means... No crosshair, no ammo counter, no waypoints, no checkpoints and no threat indicator. Also if you die in mission, no matter how far through you are, you have to start over from scratch, right back at the begining!!!
The game claims to give you an open world to explore and complete your objectives, however most have some sort of a time limit, or units that must survive to succeed, so stray too far from your objectives and it's mission over!!! Bit of a con really!!
The graphics are ok and serve their purpose and the sound is very effective, so it scores pretty well in that regard
If you are after a more realistic simulation of warfare, where you are punished for even the smallest error, you might just gleen something from this game.
For the rest of us, it's just too frustrating to provide much entertainment value.