A few I can think of for the NES:
Rygar: Last boss always got me with his 'bow-ties'.
Blaster Master: I actually got to lvl7 or 8, most people died from the bubble-crab (lvl5)
Trojan: Don't remember much from this one other than it was hard. Got to lvl 2 or 3.
Ghost'n Goblins: Worst scrolling routine ever. Really poopy agility on the knight guy and only 2 hitpoints!
Batman: Completed this with a friend. He threw me the joypad in desperation when he was out of special weapons and the last boss almost had him. I found a stupid bug and punched the sucker to death (in the croth).
Jamen jag tror att han skäms, och har gömt sig. Vårt universum det är en av dom otaliga spermasatser som Herren i sin självhärliga ensamhet har runkat fram för å besudla intet.