I was born in 1990, which was Major but the first one I can remember is Toby Blair (although obviously at that age my awareness of politics was considerably less than it is now).
Pretty much all of them in my memory have done something the majority considered to be handled badly. I think the difference is that Blair, Brown and Cameron were confident in their decisions and the conclusions they came to. They held firm on those policies and mostly had the respect of their party. Although Brown was notably less well liked than the other two, that still didn’t seem to sway him in confidence of his plans.
May and Johnson both seem to have lost the support of their parties and seem to be running around in the dark. So in terms of a global pandemic, we probably don’t want to be running around in the dark so in theory any of Blair/Brown/Cameron would have at least been more firm in their decisions, even if they were ‘wrong’.
Whilst I agree that Johnson couldn’t predict a global pandemic and we don’t know how any of the others would have reacted. We do know that Johnson was part of the MPs declaring no confidence in May and highly critical of her deal. He then had ‘an oven-ready’ Brexit deal (which wasn’t massively different than May’s deal from my perspective) and was voted in on that. Here we are, 11 days for leaving the EU and we’ve got sweet fuck all. Actually sweet fuck all would be a step up from what we have, which is going to be a firey mess. On top of that, knowing that we do not have a deal and that companies were stockpiling in case of a no-deal brexit, which government encouraged, he decided 5 days before Christmas to mention to the world that we had a new strain of coronavirus that means nobody wants to open their borders to us (understandably). He knew about this strain in September but decided now was the best possible time to release that information. So as cases rise and we face a no-deal Brexit we have miles and miles of lorries queuing to get into and out of the country.
I don’t know if he’s the worst PM we’ve ever had but he most certainly seems like the most incompetent one and the one least likely to be able to think strategically for the long term.