Yeah. It can’t be underestimated how key a role he played in keeping the fight against the Nazis going, particularly in 1940. When Chamberlain resigned, it was between him and Halifax (who had the backing of Chamberlain and the King) for the Premiership - had Halifax not lost his nerve, it’s almost certain that Britain would have sued for peace with Hitler in June 1940 and history would have taken a very different course.
I find him a highly fascinating character, largely from a MH point of view. His ‘black dog’ depression and fits of extreme mania where he simply wore those around him down to complete exhaustion.
Although I think it’s fair to say he liked war and the opportunity to play at being a general, he was, by and large, totally shit at it, as Gallipolli and the Norwegian campaign in 1940 proved. Many of his domestic policies were at best short-sighted or downright abhorrent and he was, of course, a brimming imperialist with all the racist and xenophobic undertones there-in attached.
So, GOAT - clearly anything but. A complex and deeply flawed man capable of great moments - yeah, I think so.
Anyway, tl;dr