Well, I'm not particularly fond of most metalcore, and not even really of Unearth, but I got the CD from a sample song I heard of it, and they've improved... This album pretty much stands out... It has some amazing guitar work in it, and the drummer gets a little more varied. It's worth a listen. this time instead of their usual mix of shreds and hardcore at the same time, now the majority of songs find their roots in the hardcore strain, with some amazing shredding thrown in.
http://www.youtube.com/watch?v=RBu8LGRX0II
http://www.youtube.com/watch?v=FJa614JB91s