I didn't really care too much for the weapons arsenal overall, it didn't feel like it was effective enough. The soundtrack is good, but not great by Megaman standards. The level design was good though.
I found the game kind of challenging but maybe that is because I don't know the game very well, or the Robot Masters tendencies. I felt some of the jumps in the game were tricky, and more prevalent compared to the previous Megaman games.
Even if it's not the best Megaman game on the NES it's still an above average game.