just block low against superman, you will block everything from him because his overhead are so slow that you can see them coming. Also every wakeup attack of supes is punishible, even air grab so I don't know what people are talking about. I think they are butthurt because of the zoning and not the loop which is strange. Take away his f23 startup frames and he lost every good string he has. The other ones are all 10 or more frames for startup only 1 is 8 frames but if you know that against supes you have to block low ALWAYS, and I mean ALWAYS, that move won't work because is high. The only time you will get trouble about an overhead is mb heat vision overhead, but you have to be such a bad player to not block that overhead after heat vision, because it is so obvious that it's coming that it's not even funny.
Seriously people, just block low ok? 22-3 is predictable, f3 is predictable and jumping, heat vision mb are predictable too so what do you need? also, batman beats the loop just with 11 easily.
PS: if you block high against him you don't know how to play.