Double Dragon 3 is both frustrating, and one of the best brawlers of the 8/16 bit era. Better then Streets of Rage and Final Fight from a pure gameplay perspective.
Although I also think SOR 3 is the best of that series, and everyone else likes 2.
It's funny that people downvote those games as "too hard", yet somehow Battle Toads enjoys a reputation as a legendary game, and it defines "Nintendo Hard".