Worse. I wish we had Blair.
?? Well maybe you wish that, Afghan and Iraqi people definitely don't.
Honestly I'd be down for a dead squirrel to lead the Labour party. They have their issues, but at least they aren't going to actively put their own ego ahead of the fate of the whole country. An actual vote, a promise to revoke article 50 if we don't have a deal by the deadline, were all things that could have happened if he'd done his job and represented the opinion of the people that actually voted for him. The majority of his cabinet straight-up resigned and he kept pushing on. He's done more damage to the opposition than Brown or Blair or anyone at the worst possible time. The only reason Labour isn't utterly unelectable at this point is because Theresa May is so incompetent she tried to fall on her sword and missed.
If you're talking about the MPs who broke off, I'm pretty sure that that wasn't the real reason these people resigned. I think these people resigned mainly because they did not like the direction Labour was heading to. I didn't know about people resigning from his cabinet. From what I can tell there's a change in direction happening in Labour, and this could be for the better in the long run, but maybe don't do it while Brexit is happening? It was really dumb to not adopt a clear enough stance on Brexit earlier on, but it was kind of expected, he used to be pro-Brexit.
I get the feeling Corbyn would do the same, that's all. The thing about Blair is that he lacks morals, but he at least adhered to the basic concept of a democracy. Corbyn isn't concerned with anything but his own petty politics, he's officially anti-war but he's officially a lot of things, and it's not backed up by how he acts. If declaring war would let him stay in charge of the Labour party he'd do it in a heartbeat.
The charitable reading of Corbyn is that he's an idealist, a stick-to-his-principles left-wing campaigner that's more concerned with ideals than putting anything into practice, or actually making any change or actually making anything better. I was optimistic for Corbyn when it started out, but at this point it's becoming apparent he's everything Blair was, and also lacks any political ability. The best I can say for Corbyn is that he was a good MP, a voice that raised important issues when he had no real power by himself and was only a voice. He's just a god-awful leader who's more concerned with being sure that he's the one in charge than actually improving the lives of anyone. It's not that he was pro-brexit, it's that he
is but most of the people that voted him into power aren't, so he's keeping ambiguous so that he gets their support. He'd do the same on anything, war or otherwise. He doesn't care that in the current climate he's basically unelectable so we're due five more years of Tories when an election comes around so he's never going to have a chance to put any of his reforms into practice, he doesn't care that because of that he's just going to be making life worse for pretty much everyone, just so long as he gets to serve his ego.
If Corbyn had been in Blair's seat, the Tory candidate John Major, the guy who'd led us through the first Gulf War, would have been the one in charge. I don't call that better.
Any leader who sees this happen to his shadow cabinet:

And thinks he's leading the party rather than causing chaos is at best deluded and at worse actively malevolent, and putting him in a seat like Blair's wouldn't have fared any better for anyone except JC himself.