"Octavarium" - eradicate Full Circle and Razor's Edge and it's a good song.
What about IV: Intervals?
I love love love Intervals! Such a great climax and the instrumental part is amazing as well, though I wouldn't really miss it, either. But the that build-up, and that release scream are the best part of the song, by a long shot.
Razor's Edge is fine.
I know I'm in the minority with my opinion, but to me Razor's Edge just feels tacked on after that amazing climax in Intervals, and the solo is boring. And no, it has nothing to do with it being unshreddy, it's just... boring. Like the TMOLS outro solo, it just doesn't really do a lot to me if it's just ONE FUCKING MELODY repeated for two minutes.
Also, another one that I thought of: "Swin to the Moon" (Between the Buried and Me). None of the parts are really bad, but it just feels a little uninspired and the parts don't really transition very well into one another. I think it would have been better to make, like, three smaller songs out of it instead of just cramming all of these into one epic.