It doesn't seem like rap to me, because the vocal's are meaningful and some are metaphorical - so it will usually mean something different to each person.
The three albums are amazing, and really underrated. They haven't got much promotion but still get big shows with Ozzy Ozbourne, Slipknot, Pantera and other big bands.
I used to live on the old site, and I never saw "Segression" and "NU-METAL" in the same sentence. Let alone the same paragraph, page, or entry. I don't think I've ever saw those two words together until you said it.
And I don't think they are "self proclaimed best", either. They are often putting other bands up high, and never themselves. No, I don't think they're doing it to look "cool", but it's what all musicians should be like - most are too damned egotistical. Most of them, however, are fans of the music also, and do it for the music. Not the money.
And I cannot see Segression selling out to make some money.