No, I completely disagree. Corman never claimed he was making great art; he just made films to make money. It's a testament to his skill that he ended up making some pretty good films very quickly and on very small budgets; particularly the Poe adaptations.
Films like Bucket of Blood are crying out to be remade. Even the obvious exploitation flicks like Slumber Party Massacre are well-made and tongue-in-cheek, even if they do deliver the requisite gore and tits'n'ass.
Francis Ford Coppola, Ron Howard, Martin Scorsese and James Cameron all learned their trade under Roger Corman.