A good idea but badly executed
The new setting is great and some parts are cool like the huge guns, the chimera tanks, the stealth melee fighters, the new gun, etc. It's also very different from Fallout 3 itself so may bring a nice change in pace. You can also put together your own squad and pick the roles inside that team.
It's too much an arcade game focused on combat. RP elements are practically gone: you can't loot corpses, they disappear and health & ammo can be refilled at "checkpoints". The game is extremely linear as well and it's basically an endless road of killing and more killing until you reach the end. Your team's AI is also pretty terrible and can't be commanded at all except for very basic commands that are useless in combat
The Bottom Line
In this add-on, you enter a VR world where you do a re-enactment of a major battle in Alaska against the Chinese. It's a training mission focused on combat and nothing you are given in the simulation will be taken back into the "real world" when it's over. You do get some cool unique weapons as a reward, though, including a gauss gun.