Collison Course would have been better if it were an equal mix of Jay-Z and Linkin Park. Most of it is Jay-Z, lyrically.
Big Pimpin'/Papercut and Izzo/In The End are not very good. Just one verse from LP over a better sounding version of a Jay-Z song.
POA/99P/OSC is really good. Sean's rapping goes well over both LP songs and Mike rapping as well makes the song better. My personal favorite on the album.
I believe Numb/Encore is the best mashup on the album. The instrumental is completely different, unlike the other 5 tracks, and flows very well, with a slower tempo than Numb originally is.
Had Collison Course been longer, and more LP lyrically, then I would not considered voting it out so soon.