You think this party is a nothingburguer because Corbin made quite bad mistakes in the past as a political leader?

It is to do with the masses/electorate; that is how you sublate Great Man Theory. (And it is "Corbyn") If there are meaningful successes it will be despite his present politics.

He was a leader where party members were fired in the name of fighting "anti-semitism" while there was ethnic cleansing ongoing. At the height of his career in Labour he staffed it with liberal zionists. He was a longstanding member of a party over the past century responsible for various war crimes and crimes against humanity.

And despite the above people want to rally around him; what does that then say about those masses that they are privileged enough to ignore those mistakes? That at best they give the impression that they are happy to have the loot of imperialism shared more equitably? That this is a vehicle to blunt the edge of what could be achieved by still acquiescing to bourgoisie electoralism?

Is being better than a majority of other Western politicians the low bar that one wants to hold as a high standard?

Revolutionary potential will be despite all of the above, not because of it.

To dismiss the lessons of the global south is a bigoted lens only Westernism can permit. Instead, learn from their organising under much more challenging circumstances with significantly less resources.

For those lurking please read broadly, educate yourself and open your mind of what could be possible.