This is usually the most underrated of all games. Like Mega Man 8 and 6, i thought they were great. Six actually became my all time favorite. But i don't know anyone who says he/she likes them.
But some people love 5 and 7, while i thought they weren't that good, but we aren't talking about those games right now.

Graphics: This was kinda hard to rate. It had the weakest graphics in the whole series, but still very impressive for NES. So i decided to rate this 7.

Sound: Ah, i love this soundtrack! Especially both boss themes and Dr. Wily stage themes! They felt like you were actually approaching Wily's castle, and not many NES games could do that. Mega Man 2 Wily's castle theme is overrated.

Addictiveness: Mega Man game i play the most has got to be Mega man 6, but even still, this has some very interesting differences to the other Mega Man games that make it so enjoyable to play.

Story: What?! A story in a NES game that WASNT cliché?!

Depth: Alright, alright, this game isn't very long and it doesn't have many secrets either aside from the magnet beam. At least they fixed that in Powered Up!

Difficulty: Now this is what you call hard. This was the second hardest in the whole series, and we all know why,
That Yellow annoying blob monster.
 
Overall: This is a underrated masterpiece in the Mega man history. Everyone should try it out and see what i mean.

I have never played Mega Man before. It seems like a pretty decent game though, because almost all of my friends on this website have played it, and really enjoyed it. I feel like after reading this review, I should check this game out. I always hear people on this site saying that the Mega Man series is a great game to play. I also like how you reviewed a game that is "Under Rated" I like reviews like this, because you only usually hear people talk about very well known games or only part of the series for any game. 

Underrated? Wow... That's sad. I've played this Megaman game a few times before, and it's pretty good as the other games of the saga in my opinion.

Great review you've made here, keep it up.

P.S: Mega Man 2 Wily's castle theme overrated? Nah...

Eddy88 : Thanks.
And sorry, but it IS overrated.