Rabbids is not a game genre, are just characters. The quality of a game depends a lot on the genre. Last Rabbids games were different genres. More stupid genres. Last Mario RPG was developped by someone else. The RPGs developed by Ubisoft lately are pretty damn good.
It's also the cross-IP developed game between Ubisoft and Nintendo. I'm pretty sure none of them wants to make a garbage out of this collaboration.
Rabbids isn't a game genre. It's an IP. A low tier IP for Ubisoft, which featured in low quality, developped by C teams. Last Mario RPGs were overseen by Nintendo's bad decisions for a Mario RPG, aka "no new characters" "light story".
Which RPGs were developped by Ubisoft lately ? South Park was Obsidian, Child of Light was Ubisoft Montréal.
So... unless Nintendo developps it, with a new focus OR unless Ubisoft Montréal or Montpellier developps it, with a different focus too, aka interesting combat system, charming story and such...
I expect it to be on the same level as Mario and Sonic games.