The problem I've found in alot of nintendo games is they're pretty easy or just pretty average in terms of difficulty. One of the reasons why I tend not to play Nintendo games is because of that, I mainly play arcade games, where it's if you're shot once you die, i.e. Metal Slug, Dodonpachi, or other games where you get a challenge out of the opponent(s), i.e. Street Fighter 3, Marvel vs Capcom, Change Air Blade, Call of Duty, Gears of War.
It's understandable why Nintendo makes their games like that though, because then it's not too difficult for your average game but not too easy for your game addict. To me though, it's all about the challenge, all about how many shots you can dodge until you finally get hit, all about if you're able to execute that combo correctly, all about if you can take out that tank before it destroys your base.
So my question is, while classics like Metroid and The Legend of Zelda are fun, do you think they'd be funner if they actually presented some challenge(While there is some challenge in them, it's usually not challenging enough where the average gamer would tend to die alot, or even once, perhaps)?