NES Games With Near-Perfect Difficulty Curves, Ranked

Alright, listen. I'm not actually that good at video games. I enjoy them, but I'm not good at them. Give me a tough boss fight, a tricky platforming section, or a game that expects me to memorize a dozen enemy attack patterns, and there's a decent chance I'll be seeing the game over screen more often than I'd like. That's why I appreciate a good difficulty curve. I don't mind a game challenging me, but I want it to teach me what I'm doing wrong before it starts making my life miserable.