Your pellet game must be on point to keep people out (or you get steamrolled in CQC), your damage output is among the lowest in the game, and every one of your kill moves requires precision to land and are punished heavily when missed.
Umm, as a Mega Man main, I have to say you may be underestimating exactly what level some characters have to go to "micromanage".
Mega Man has seven projectiles to decide upon: Pellets, Blades, Crash Bomb, Mega Buster, Air Shot, Hard Knuckle, and Leaf Shield. However, these are all considered nine moves out of his entire moveset (pellets being neutral, side, and NAir). As involved as each of them may be, it's still not too different from any other character choosing their proper move in the proper situation. Mega Man's most involved move is Metal Blades in that it can be used as an item in various ways. That right there is a sort of micromanagement, but honestly it's not all that complex in comparison to certain other characters.
See, Olimar has four actions strongly dedicated towards managing his pikmin. However it doesn't end there. Olimar's micromanagement comes from all six of his pikmin causing his smashes, aerials, and throws to act differently and him having to intentionally cycle through them in order to perform optimally. It goes beyond "right move for the right moment".
Pac-Man has one primary special that requires micromanagement. But his Fruit special is still a bit complex in that he can call upon eight different projectiles from a single special, all of them behaving quite differently. In a way, Pac-Man has more moves than most characters. Then you add Fire Hydrant into the mix for even more shenanigans... Oh, and his custom neutrals too, meaning Pac-Man players get to experiment with three sets of eight projectiles - 24 in all.
So yeah, Mega Man has a little bit of micromanagement in his Metal Blade and projectile game, but I think it's a bit more prevalent in a character like Pac-Man, and it's a serious part of Olimar's game. There's also Rosalina who has to keep Luma in mind, Robin's tome spells, Duck Hunt Dog's can manipulation...