I'm gonna chime in too. If someone asks "what's good on a brute?" Then I doubt the player is all too concerned with concept for their character. Me, I have tried all sorts of sets based around concept alone, even 'so-called' bad set choices and have never been told I picked poorly. Maybe because I play on Everlasting where concept seems to be a driving force on these decisions or maybe because I haven't teamed with those types. Alternatively, I also think those that gripe about certain powersets probably have bad experiences with them personally (it isn't their play style) or second hand (someone else wasn't as skilled with the set as they were hoping and weren't impressed because of it).
Of all my alts I have never found a set that was definitively bad. Even my fire/Regen brute or rad/energy tank that I got to 50 before deleting because I didn't like their concept.