Yeah, that's pretty stupid. Karate Kid alone was pretty difficult.
I get why they say it's easy, though. Once you get into a rhythm and know how to avoid getting juggled by 2 enemies, it really isn't that hard, despite the wind and goofy jumping. If memory serves, I beat it as a kid on an overnight stay at a friend's house. He had the game, and I remember playing it a few times on previous visits, then beating it one late Friday night/early Saturday morning. Years later when I had my own NES and picked up a copy, I remember beating it again. I very much consider myself to be an average-to-good gamer, so I think it's just finding that rhythm that's the real trick.