The only reason the B-36 saw any operational service post war at all was the USAF's need for a credible intercontinential bomber. In the late 40's and early 50's the B-36 was it. The B-47 didn't have the range or load capacity. The B-52 wasn't on line yet. So, in order to justify their existance as a seperate service the USAF needed the B-36.
It certainly was not because the aircraft was really that good. It wasn't. By late 1940's early 50's standards it was a sitting duck to enemy interceptors. It was slow, huge, and horribly unmaneuverable. The USAF tried to help this with more powerful engines and then adding four small turbojets. But, these did little to fix what was an obsolete design before it even flew the first time.