I used to love this game when I was a nipper. Pretty easy as you'd expect but amazing gameplay made up for it. To this day I still get the music from the first stage stuck in my head.
World of Illusion was also cool for the two player co-operative mode, which I always like, even though that game was possibly the easiest I've played (barring Guilty Gear X on GBA). Got it one Christmas and finished it within about 90 minutes.. That's what I call value