That wasn't a spinoff. That was someone borrowing (and mangling) canon from one show and creating another, completely different show. And then shoehorning a couple of beloved characters from another show into it.

Ha, yes. Mangled was the word that sprung to my mind too. I was left with a slight feeling of disbelief that of all the things they could've done with canon/the SPN 'verse this is what they chose to do. Fast forwarding to the Sam and Dean bits sounds like a more tolerable way of watching this!