Hopefully this time they won't screw over the devs. There was a lot planned for the first one that they had to cut because Viacom (Nickelodeon) gave them minimal budget, they had absolutely no wiggle room on release timeline, and they were outright denied requests to allow things like alternate costumes (on the basis of not diluting brand identity, but then a month later releasing a mobile game featuring heavy gatcha elements for random dress up costume pieces for Nick characters. The lead dev was so pissed off he called it out on twitter.)
I played one for like an hour with a buddy. It was kinda meh. That being said I think we need more smash clones on the market. Smash releases like what every ten years haha.
All-star Brawl 1 wasn't really a smash clone tho, and I think that's why it didn't do well. It used 3 buttons (light smash, strong smash, special) instead of just smash + special, didn't allow rolling unless you tech, etc. It just required too much learning for a smash player to be considered a smash clone.