The story is amazing. It's an interesting take on the future (I believe its 100-200 years in the future). You play as a guy "named" Monkey. He's like a half man/half monkey on steroids. The co-op between him and Trip is interesting. You have to make sure she stays alive or you will die. She's a tech nerd...a hot tech nerd.
Everyone is saying the combat is repetitive which it is in a way. You have the option on upgrading equipment to your liking/playing style which is an interesting option.
The story is really what got me like I said before. You feel like the characters are real. You feel when Monkey is hurt or Trip is down or one is mad, etc. It's believable.
I'd say rent this game and give it a shot. I hated it to begin with but once you get 1 to 2 hours into the game, that's when the story actually starts to make you addicted and want to keep playing.
I can't wait and am hoping for a 2nd game to see how these characters continue to develop.