Hmmm, maybe. In my opinion to ask for 'reasoned criticism' of a comedian/TV presenter is a waste of time. Nobody is going to produce any form of technical analysis, and I can't really see any reason why they should. If you find a comedian not funny then why do you need a reason for that?
As far as Russell Brand goes, my instant reaction to him is that he's extremely irritating. I have no idea whether he has any talent or not, and I don't really care, I'm certainly not going to listen to him long enough to find out. That's reason enough for me to vote 'shit' and dismiss him IMO. He's only a TV person anyway, what does it matter?