My sarcasm detector may be broken, but in short, no. Even a "good" professional can give bad advice. I love my accountant, but I still catch things he's missed occasionally. (And he catches things I've missed more often.) It's a partnership. Unless you're a mega-corp with in-house professionals, you're always going to know your business better than your accountant/lawyer/etc., and you're always going to care at least somewhat more than them too.