I think it kicks ass. It tore me away from GoW.
The online is great. I read the reviews, played the demo, and was sketchy. They fixed a lot of the crap that was in the demo, and online is smooth as silk to get into.
I love it. I'm level 26 online, oh and that's another thing, as you play online you earn achievements and new character outfits and new characters to play as online. All the more motivation for me to play online. I really want the NEVEC character. He looks so bad ass.
Missions are fun, and the sheer madness in terms of size of some of the aliens are crazy. Its great too eventhought the cutscenes don't make sense.