He advocated for Britain’s interests first and foremost - like Trump does America’s. For that I’ll give him credit.
However, Churchill, who relaxed by building stone walls, (directed) the American’s (FDR, Dwight) to do certain things that in hindsight one might argue we should have not done. It is fascinating that our response to Pearl Harbor was to go and fight in Europe, sending poorly trained men to their deaths in North Africa. There were people in the feral givernment who believed Churchill was trying to get US to help Britain first preserve (avoid losses) and then restore the British Empire.
Churchill was a pretty good amateur bricklayer, but I don't think he ever did any stonemasonry work except to lay a ceremonial cornerstone here and there.
It wasn't just the Brits advocating a Europe first policy. The Soviets were screaming - understandably so given the enormous losses they were taking. In truth, given its advanced industrial economy, its possession of all of Europe and that continent's immense resources and given its world class scientific establishment, Germany was a much more dangerous enemy than Japan at that time. We absolutely should have sought to destroy the Nazis first.
FDR was always suspicious of the British Empire and was not alone among Americans in thinking that. Yet, FDR had a blind spot for just how evil and murderous the Commies really were. I have no doubt Churchill was trying to preserve the British Empire and wanted to enlist as much American aid in doing so as possible. I can understand that.
If you want to blame him for something, I think he was far more cynical as first lord of the admiralty in WWI in loading up a passenger liner like the Lusitania on which he knew hundreds of Americans were sailing with mines, ammunition and other war material such that one torpedo rapidly sent her to the bottom killing 128 Americans. He knew that would piss off the American public and help spur us into that war......a war in which we had no real national interest.
Europe First as policy predated Pearl Harbor, FDR considered Nazi Germany the bigger threat.
It was also a practical matter, the ships needed to take the offensive in the Pacific did not exist yet. It took time to build the warships and the massive fleet train of supply and support vessels needed.
In 1942 the US was desperately short of ships, by 1944 we were not.