I've never been able to attach a reason as to why the last few decades of mega man games didn't appeal to me but they didn't, and a large chunk of the blue bomber's fan base agreed. It looks like with 11 Capcom may have just righted the ship.
The difficulty is on par with a NES platformer, and it can be turned up to pretty freakin' hard if you're a massochist. Every jump seems like it's just within Mega Man's range, every enemy is placed in the most annoying spots, and even the mid level bosses tend to kill you a lot before you get the timing down, or even figure out how to hurt them. Ditto for boss fights.
In what seems to be an attempt to make up for the difficulty, Capcom has introduced (they may have done this before, just not in any mm game i've played) Dr. Light's shop. As you get your blue butt handed to you over and over again, you're amassing parts from random enemy drops. This are used as currency to buy upgrades and one time use items. Burning through a stack of five lives seems to get me anywhere from 150 - 500 units of currency which can purchase a lot. If you've not broken your controller (my ps4 controller is not chipped from being thrown on the floor) after a couple of stacks of lives, you've earned enough money to buy something that helps.
This game is currently on sale brand new for 19.99 with a game stop rewards card during their pro day promotion. Its frustrating, especially if your home theater set up causes video game input to be off by any amount, but it's a solid game that early mm fans would likely enjoy.