For most, the difficulty can be frustrating.
Good luck if you try out MMX3 blind 😅
I personally had quite the enjoyment out of X2 despite the simpler levels - the buster upgrade is fun to fight with and the Dragon Punch was hilarious to use and one-shot Agile's second fight.
I was already aware X2 is kind of divisive in how it's regarded compared to other games, but certainly not as mixed (or even majorly negative) as the reception for X3, X5, X6 and especially X7.
Although if you haven't checked it out yet, the MMX8 16-bit fangame could be worth a shot when I've seen it praised to be as good as the first MMX.
I had a friend who was good at Mega Man games. I got his opinion on this one. Will try out that MMX8 16-bit fangame.