I don't like Sonic the Hedgehog crossovers, especially shipping Sonic with ponies. I've never been a Sonic fan, he has always annoyed me with his freaking attitude.
I'm okay with grimdark, if it is an actual story. Grimdark for the sake of it or for titillation is distasteful to me. For example, Fallout Equestria has a lot of grimdark stuff, but it is a part of the story. And that story is about fighting for a better future. But stories like Cupcakes just seem like the gore is the point. And any semblance of story is just a coincidence.