The plot is standard B-grade action fluff.
But here's the thing: CHARACTERS!
IT ACTUALLY HAS CHARACTERS! People you're actually interested in seeing to the end!
Also, I love the constant jabs at Modern Warfare 2.
"We can't let the Army know! If we tell them, they'll send in Special Operations pussies with heartbeat monitors strapped to their guns!"
###
"Man, if I was on my snowmobile, I'd have beaten you guys."
"Snowmobiles are for pussies, man!"
Also, despite the fact that this game actually has MORE sci-fi tech than Modern Warfare 2, the plot is still more sense-makey and entertaining and...believable.