Super Mario Bros. 3X

I am SHOCKED at how intuitive those things are to jump on. They don't throw Mario off of them even when at a steep angle. They're just tricky enough that someone who's nervous or hasn't encountered them before will have a lot of trouble, but they're also consistent and not at all gltichy, meaning the player can know what to expect when they re-experience them later. There's a lot of potential for those spinning platforms.