In the Shadows is probably my favorite, and since I personally need to gauge their albums lyrically, I would have to say that 9 is probably my least fave because there's not a single song on it that I can really listen to comfortably. All of the other albums have tracks that I can really dig into, but that one doesn't even have one, unfortunately. Cool and KAH-reepy friggin' cover though!
Musically, they can't be beat and make some of the strongest metal out there, IMO - I just wish their subject matter wasn't so grating to me on much of the material.