Some good, some very bad, all in all, well...
The action itself, although not what was described, is fun. Explosions for one, look very cool, when they happen, with a large amount of fire and noise. After they happen, the result can be disappointing. Sure a car is tossed in the air, but there's something quite unconvincing in the way it looks after being destroyed. The "totally destructible" environment isn't totlaly destructible. Small guard posts and sheds will blow up, but solid buildings wont and trees wont either.
The weapons jamming part is pretty well done, although their range and accuracy is not too great, such as when your character stays absolutely still when holding a rifle, when some games such as the great CoD 4 actually make you move whilst aiming. The driving is not bad, not what it could have been, but ok. A VERY disappointing feature is the fact that tires will not burst. The healing with syringes and having to perform operations on yourself when wounded are very nice, but its too bad as soon as you're healed, all trace of you ever being hit is vanished.
The setting could have made an absolutely great story. That concept was obviously put aside. The story is quite bad seeing as your character doesnt seem to be implicated in any important decisions whatsoever and only acts as a mercenary carrying orders for both sides. While I'm at it, driving is repetitive and quickly becomes boring and predictable.
All in all, the action, although it would be better with a few fixes, is a lot of fun and the story is bad, especially when you take in the huge potential that the setting gave. Sound is acceptable, although a bit repetitive as well. Graphics are passable, but no where near games like Crysis.