I have bought albums that contained bands whose music meant nothing to me, but I cannot deny that they are artists foremost, even if their art is meaningless to me personally. BUT there is one caveat. Keyboard work is equally fine, though only given a few spots to really show off.
Lyrics present a materialistic, hopeless, atheistic philosophy, so if that's a problem, stay away.
Personally I don't agree with Trigaux's philosophy at all, but I don't have any problem with letting him express it. Roger, on the other hand, writes these fantastic jagged vocal lines that would tax a GOOD vocalist, and sometimes he lands right on them. And sometimes, alas, he doesn't. And I don't think he cares, either. So there's the warning.