Listen, I love the RPG Mario series, I love how colorful and corky they are with lots of comedy and amazing writing, and of course I love The Thousand Year Door, I'm just asking you that if you have the chance to play Color Splash to give it a try because it's one of my favorite games in the franchise and I think it gets absolutely not love whatsover.
True, it's barely a RPG and more like a card game but I think that's fine too, the writing is very good, it has very good jokes, stunning visuals, lovely ost... so why the hate? It's because is not like TTYD? Sequels need a shake off and after Super Paper Mario it was a fine moment to try new things, even more after Sticker Star.
If they release a Switch ver. please, give it a try, it's very very good.