>>721168903 (OP)
It's not. As an old fart, most "hard as balls NES games" that young people won't touch with a ten-foot pole are not actually hard at all, so I hope you guys agree with me on the following.
>Castlevania
Castlevania 1 is perfectly manageable as long as you remember that if you die later on a level (Stage 4 and 5), you're fucked on the good sub-weapons so it's better to just retry the level, you have infinite continues after all. The game is easily cheeseable with Holy Water AND you have a checkpoint just before Dracula so there are no excuses on losing to him.
Castlevania III is way harder, but also fairly beatable with practice.
>Contra
The first Contra game is actually really easy to beat without the Konami code once you learn the Spread is fucking broken. You got a weapon that hits almost everything on screen AND gives massive x5 damage when shot at point-blank range at bosses. You just mash the shoot button and most bosses are dead in 5 seconds tops.
Super C and Contra III are somewhat harder: Super C has that one bullshit segment on Level 6 where the alien mouths appear from nowhere, and Contra III is easy on normal mode but bullshit in hard mode unless you exploit the Crush bug.
>Ninja Gaiden
Not that hard until you get to the final stages. You have to learn that unlike Contra, enemies have fixed spawn points, so as long as you avoid triggering those, you're golden. You can also pass the bullshit final stages with the Spiral Ninpo, but you have to learn where it is mand learn to keep it all the way until Jaqcuio.
I concur that losing and beginning at 6-1 is a stupid ass design choice, tho.
>Mega Man
I don't know where the fuck the consensus began that the Mega Man NES games are suppose to be hard, none of them are. Mega Man 1 only has one hard segment, and that's the Yellow Devil. Even if you decide to not use the Pause Select glitch, his pattern is the exact fucking same everything so you'll memorize in two or three attempts tops.