I voted for Corbyn's Labour on both occasions. If I had my way he would be our Prime Minister now and leading the response to the Coronavirus pandemic which I doubt can be any worse than what Johnson is doing.
Ultimately though he had two bites at the cherry. He couldn't get it done. There's an alternate universe out there whereby the UK voted to remain in the EU in 2016 and as a result this year, 2020, would have been Corbyn's opportunity to lead Labour into a General Election. I believe in such a timeline he would be in office now because without Brexit the bread and butter issues of politics which he believes in and articulates such as anti-austerity, addressing economic inequality, investment in public services and infrastructure would have been at the forefront rather than non-stop debates over Westminster vs Brussels, Deal or No Deal, Second referendums etc.
I don't think he is a bad man. I wouldn't have voted for him if I felt that way. A lot of his policy stances I like. He got the leadership role in 2015 when nobody saw the event of Brexit coming. He got the job because he offered something different. But as time went on you can see his stubbornness and sanctimony made him incapable as a leader. This should be a lesson that next time don't pick someone who sat on the back benches for 30 years rebelling against the opposition side and your own side to get propelled to the center of the front bench. It's noble to be an activist grassroots MP but you can't be in charge of an entire party of different factions like that. To be honest I feel quite sympathetic for him. These past five years brought him greater worldwide attention than he could have ever dreamed of in the past thirty as a MP. But was it worth it? Under his leadership he had to confront three Tory PMs, lose the referendum when a majority of the party's members wanted to remain (and those who wanted to leave defected splitting the party), lose two general elections - the last of which saw the party do worse than under Michael Foot, and have the scandal of antisemitism hover in the party. What a legacy to leave behind.
I've been a big fan of Dennis Skinner for years but the biggest reason he became a beloved figure among the public is precisely the fact that for a nearly fifty year career he was kept away from holding any position of leadership that would have required him to be accountable for people other than himself.