I disagree with those who've said that this is not as good as the first one, I thought that it was actually a better album. There are loads of great artists here and they don't disappoint.
Instead of rating every track, I'll just say about the best of the bunch.
The Zutons, Calvin Harris, Jose Gonzalez, The Holloways, Maximo Park, Dizzee Rascal and The Editors all recorded exceptional tracks... I really can't emphasise how good these actually are!
The other one that I thought was quite good was 30 Seconds to Mars version of Stronger. It was strange but really quite good...
For the price Play are charging - pick up a copy!