I didn't find Ocarina of Time all that difficult.
Resident Evil 1 isn't too bad, either, especially if you play as Jill.

The games that frustrated me the most because of their ball-breaking difficulty;

Hagane
Actraiser 2
Battle Squadron
Mystic Defender
Shadow of the Beast 2 (Amiga version, Sega CD and Genesis versions are easier)
X-Men: Children of the Atom
Godhand