It has lots of good things about it and some terrible things read on...
-Amazing graphics -Fun co-op -multiplayer is fun -not an easy game -Huge maps -Addicting campaign
The bad-
-Should of been third person -Cant take cover -Instant play wasnt well thought up -There are like 9 difficultys and it doesnt get any harder after the 5th -No story mode
The best part about the game is how fast paced it is, you can not look away from the screen for 3 seconds without dying and the warfare mode is great fun.
I just bought it 4 days ago and have had some fun with it but you kind of get bored after a while but a couple hours later you will want to keep playing it. I dont think it would be worth buying unless you are a gears of war freak.
Mostly because there are too many bad things with it to enjoy the good.
If you like multiplayer games i suggest gears of war 2 or borderlands.