There has been talk about the Guitar Hero 3 version of the album sounding WAY better than the original cd...so much so that it made it to Rolling Stone magazine here:
Article
Pretty interesting stuff to read...so I did a little research and actually found a rip of the GH3 version and am listening to it right now..... AND IT BLOWS THE CD AWAY! There are actual dynamics...I can feel the kick...no muddy sounds...it's UNBELIEVABLE! The article is TRUE!! WTF??