My immediate answer - Sonic fans.
I don’t really know what Sega and the Sonic Team can do anymore to make these fans happy. They’ve revisited the classic formula a few times, they tried going modern routes, they tried 2-D sprites in some entries, they try going full 3D and whatever. Nothing ever seems to be enough and that’s even when they’ve tried listening to the fanbase a few times.
Nothing seems to matter, regardless. The fans will find something to be upset about with Sonic. Anything.
Nah. Mando, Rogue One, Lower Decks, and New Worlds wouldn’t have all been received well if they were difficult to please. It just takes doing more than the absolute bare minimum of shitting out slop and expecting the deluge of garbage to somehow please people that have already received far, far better in the past.
Both IPs have their expected tropes and ‘feel’ already established, for better or worse. It shouldn’t surprise people that massive deviations in uncreative directions weren’t well received.
When peoples’ well liked IPs turn out to be nothing more than a coat of paint on Generic SciFi Script #350386, OFC fans won’t respond well.