"Most successful leader for covid"? Remember the Cheltenham Festival fuck up, remember the missed Cobra meetings, remember the massive PPE failures, remember the care home deaths? You seriously believe no other national leader did better than that?
As for vaccinations, yes, they started well, mostly because of the Herculean efforts put in by the NHS to make it work. But it's accepted that it all went a bit disastrously wrong as soon as complacency set in and the government failed to ensure adequate supplies of boosters.
As for Brexit done and working, hahahahaha.
Do tell, what is your view on little matters like repeated iies to Parliament and the electorate, blagging redecoration costs off Tory donors, the Owen Paterson fuck-up, to say nothing of reappointing a known sex pest to a position of power and then sending people out to lie about it?