I am not against Corbyn's ideas or his bent, but he is hopelessly ineffectual as a national politician and party leader. His ideas aren't all that bad, but his brand is, because he sucks at messaging, and is no better at corralling or convincing his partymates. He and his leadership have a dull a sense of political strategy and tactics. Arguably being right or more compassionate doesn't win you anything outside of school debates. Supporters say Jeremy Corbin cares. Well, he can care all he likes, deeply and to his very core, but he won't be able to realize any of his ideals without a capable coalition which must be taken seriously, and not laughed out of the room. Corbyn has faced strong opposition from some of his own party members, the Tories (previously--they are largely unconcerned with him now), and various entrenched interests. I do not suggest he has an easy road. Politics is a rough, dirty business, after all. People are going to be unfair to politicians....
Anything, everything, and nothing at all for years at a time.