It isn't terrible, but Mercury on Clutch's Blast Tyrant is pretty weak, especially the end bit, where they decided it would be entertaining to make their guitars sound like they are farting.
The opening track on Eluveitie's Slania is pretty boring, too. It is probably supposed to sound mysterious, but it is just annoying, and I usually skip to the second track. Not sure that it counts so much, though, since it is basically an intro track. Kind of like The Hellion, except the Hellion is awesome.