That's why there is an insta-win button. You know, the one who unlocks everything and says you've completed everything?
The game doesn't cheat. I'm being honest that even if I died of what I find cheap tactics I know that I still died because I sucked. I suck at playing Ninja Gaiden, thus I lose when fighting. Blaming it is cheating would make me a bad loser who keeps being bad and never learns.
It's not a piece of crap. You just couldn't handle the challenge, the one people who buy Ninja Gaiden is looking for. Or... the one most people who buy Ninja Gaiden is looking for.
But yeah, I've noticed you aren't the kind of person who doesn't likes a challenge but likes the entertainment. No worries, some just don't like that kind of stuff. Me, I like both, as I find the challenge entertaining.