I don't know how to read Corbyn as the leader of a major political party. He seems affable, very intelligent and well-informed, and consistent in his views over many decades. That's on the plus side.
His laid-back, 'walking dead' absent-minded professor campaign style just has me completely baffled.
If the polls are to be believed, it's not gone down well with the public (allowing for external factors of extreme media/establishment hostility, the ceaseless character assassination, even from within his party).
I've seen similar before, here in Canada:
https://en.wikipedia.org/wiki/2006_Liberal_leadership_bid_by_St%C3%A9phane_Dion