Nope, seems lame and I am a super smash bros fan.
I guess the reason for this is the characters, I don't think All-Stars characters fit well in a beat 'em up game. Nintendo's characters seem to fit far more fluently in the mythos of the game.
I am curious to see how well it sells/reviews/escapist-opinions. Maybe it will play better than SSB, but I kind of doubt it.
But...like some said, the character roster hasn't been fully announced and we still have a lot to see, so maybe my mind will be changed.
There are way too many games out there and coming out that I can't afford to pick up something anymore unless it REALLY appeals to me.