I'm one of the few people who thinks this game is good, at least this Super Mario All-Stars version, thanks to it saving after each level, which does alleviate the frustration and makes overcoming tough challenges more satisfying. I also think this game is overhated. Aaaaaaaaaaand, here we go, my credibility goes from zero into negatives now.

(BTW, I recommend watching this retrospective by Jeremy Parish for the context behind this game, hopefully it'll give you a better understanding on why it is the way it is)