I listened to some of it in the car, but didn't pay full attention and the quality wasn't so great. I'll have to listen with my headphones when I have the time.
I listened to the whole thing just a few hours ago. In summary the whole score is, in my opinion, a very fast-paced and exciting collection of sounds well put together. Some amazing ambient and bass-drops are given to us and really it's amazing. My personal favorite from the score has to be "Drug Lab", it's sexy.
It's not bad, but most of it doesn't stand out very much. I'll probably end up keeping a handful of tracks, plus the GBC and Chino one. Reminds me a lot of the Social Network/GWTDG soundtracks by Reznor and Ross.
Mike uploaded all tracks from soundtrack on his YouTube account: http://www.youtube.com/user/OfficialMikeShinoda?feature=watch
I listened to the song a few more times. The flows are catchy. I am just not a fan of the "Kill yourself/Call me if you need some help" part.
I'm really glad Scoop didn't appear for vocals on that song. That probably would've ruined it for me.