I didn't mind the Hanna-Barbera universe-building since among my favorite episodes of Mystery Incorporated are the Hanna-Barbera crossovers. Yes, Will Forte is the most off-model Shaggy ever but he was at least trying to do the voice and he did supply the emotional bond with Scooby. Gina Rodriguez, while also fine at emoting, didn't even make an attempt to do Velma's voice - unlike every single voice and live action Velma in the history of the franchise.
Other complaints: Simon Cowell - really? What year is it, 2005? And why is 'Fred is a dumb jock who happens to drive the Mystery Machine' being resurrected? Mystery Incorporated and Be Cool, Scooby Doo had an intelligent, psychologically complex Fred, and Where Are You's Fred certainly wasn't a meathead. Still, despite those problems it had some fun visuals and nice character moments so I wouldn't mind a sequel.
Other complaints: Simon Cowell - really? What year is it, 2005? And why is 'Fred is a dumb jock who happens to drive the Mystery Machine' being resurrected? Mystery Incorporated and Be Cool, Scooby Doo had an intelligent, psychologically complex Fred, and Where Are You's Fred certainly wasn't a meathead. Still, despite those problems it had some fun visuals and nice character moments so I wouldn't mind a sequel.