The only reason I ever tried this was because Earthworm Jim was playable. It took only a half-hour for me to get bored and stop playing.
The graphics were rather poor. The twelve characters all had ugly looking and outdated 2D sprite models, and they still moved in claymation styled animation that looked totally out of place on the N64. The stages had simple and boring looking designs with grainy textures and dull colors. This would have been better suited for an arcade or very early N64 release at least two years prior.
The controls tended to be clumsy and unresponsive so, more often than not, you'd have to rely on just buttons mashing to beat your opponent.
There was a total lack of multiplayer and only one fighting mode, despite being released in 1999.
The music was unremarkable, although the sound effects included wacky slap-stick noises you'd hear in a cartoon.
The games main highlight was its first-rate voice cast, even though the lines sounded poorly recorded. Dan Castellaneta reprised his role for Earthworm Jim. Frank Welker, Charlie Adler, Rob Paulsen, and others were present. The characters made cheesy but enjoyable jokes and their lines were worth a laugh.
You could say this game is so bad, it's good. And I'd agree it is. But just barely. Otherwise, it'd only interest fans of the past games or bored gamers with nothing better to play.