I played some NES games on emulator with a playstation controller. It doesn't feel exactly the same as on the console, but maybe it's subjective... I always found Mega Man 2 particularly easy, while Mega Man 1 is freaking impossible. I remember practicing that damn cyclops guy several times before I finally remembered the pattern he moves in. It was still horribly difficult. Then came that clone boss which was also horribly difficult, as well as that thing in the sewers that sped up. And if you fail three times, start all over. I can't understand how I did not go insane completing that game as a kid... Mega Man 2 is a cake walk compared to the original. 3 is relatively easy but gets hard when the bosses from 2 shows up in the wiley levels. 4 and 5 are both pretty easy.