Launcelot FTW!
As for beat'em ups, I personally recommend the Power Rangers games, and well, the rest you can find better ports in Arcade (Final Fight, Captain Commando). Save for Final Fight 3. That's SNES exclusive, and it kicks ass. Not as much as Streets of Rage 3, but it's definitely an option worth a thought. Then there's the BattleToads games, and the BattleToads / Double Dragon crossover mentioned above.