without that the game would have no challenge
Not true, the original mario didn't have that unresponsive timing and it was still very challenging.
thats the only thing you can come up with?
No, there are probably many other things, but you can't see those because that very annoying "challenge" rears it's ugly head every time you press a key. Unresponsiveness is a bug/error, it shouldn't be part of a game.
wait till you release something (if you ever do) im gonna analyze it with a fine toothed comb
Seeking revenge after constructive criticism(critique) is not a very mature thing to do.
-Gandolf