I think this is when Mega Man really starts to find its footing as a series. Fun Robot Masters, tones down the difficulty a smidge to where it's still fun and satisfying to figure out but isn't cartoonishly punishing. And the post-Robot Master stages are fun! Waow! That's possible. The only annoying thing is when they require Rush Jet for certain parts and your only way to regain some energy for it if you die is farming enemies.