I understand what you say about May Anya and I agree with it.However, she is not the whole Cabinet or the Party.
May has performed dismally for most of the time as PM, but because she is not very good, doesn't mean that Corbyn would be better! I think that he is actually a very weak character, not a strong one, and is led by those around him,not least John McDonnell, who is now the shadowy power behind the throne, they keep him hidden most of the time, and also led by 'Team Corbyn' a powerhouse of ambitious and very left wing driven people, plus of course,
That grassroots soon to be powerhouse of Momentum.
Both main Parties now have poor Leaders.For the sake of stability for the country I hope that May stays for now, but is replaced within 2 years with a better Conservative Leader, or, at a push, if there was a General Election then a better more able and less very left wing Labour Leader.I can see the latter happening unfortunately, the way things are going with the Labour Party.