It would have been a situation similar to the unescorted raids of 1943 since no fighter was going to make that distance (although tests were done using a B-36 to tow or carry a fighter under the fuselage). The B-36 had some pretty awesome firepower and more accurate sights. I'm not claiming that the B-36 was invulnerable, but it did have a better chance than a B-17 on its own.
Being bigger is a bigger target. And if you have a Me-262 coming at you at high speed your slow firing cannon isn't going to do much because the Swallow will be bloody hard to hit.
The B-36 carried 16 20mm cannons. Now, over Korea, B-29s with .50cal mg took their toll on MiG-15s (one actually became a MiG Ace shooting down 5). It seems reasonable that the B-36 would have shot down alot of Me-262s.
.50 cals are a lot faster firing than 20mms. The cannon would have been hard pressed to get a hit. Losing fuel would have taken its toll on even a plane as big as that, and yes exploding would have been quite bad.
The B-29s in Korea was made obselete the Mig-15s ripped them apart.
I know that but I was discussing their defensive argument. If the B-29 could shoot down MiG-15s, then the B-36 would have been capable of shooting down Me-262s. The lower rate of fire means few hits, but the greater power of the 20mm shell compensates for that.