Yeah, hope you don't take it as an attack or something, but as a beat 'em up fan myself, I get sick of seeing the same old nostalgia games considered the best. Sometimes you really gotta step outside your comfort zone with an open mind, and in my opinion the best come from the developers you don't expect.
The Denjin Makai series(includes Ghost Chaser Densei, something of a port of the first Denjin Makai on the Super Fami) for example, is by WinkySoft, of the Robot Wars series.
Ninja Baseball Bat Man and Undercover Cops(also ported to the Super Fami) are by Irem, who's beat 'em up input you'd most associate with Kung Fu/Spartan X and Vigilante.
Night Slashers is by Data East, who you'd think of Bad Dudes/Two Crude Dudes when it comes to beat 'em ups.
Dungeon Magic is by Taito... You do not want to play the majority of their beat 'em up input... Another good one by them though, is Warrior Blade: Rastan Saga Episode III, never left Japan, plays similarly to Golden Axe(still worth checking out if you're not into GA).