FortuneCookie posted... No, not at all.
The "get hit and you lose your weapon" mechanic completely ruined Adventure Island for me. It's not fun slinking away from enemies with your tail tucked between your legs. Defeating enemies is fun. A game can still be challenging, but enemies that can't be beaten or can't be retaliated against should not be a thing in video games. If we're not supposed to hit them, just make the obstacle a mine or a swinging ball 'n' chain or something. Don't place a sniper on a roof where it's impossible to ever hit them.
I don't like it, so it should never be done.