The best non-MCU content has generally been the stuff that doesn't try to be a carbon copy of the movies. Spider-Man PS4, Immortal Hulk, Earth's Mightiest Heroes, etc. There's definitely space for MCU animated content (I'd love to see more of the Ravagers or a young Thor).
But there's equally enough viability in well-funded animated projects that take risks and don't embrace everything the movies have done with the characters. And there's increasingly less reason not to do so as the MCU exposes audiences to the idea of a multiverse. People understand that different versions of these characters can exist, why not embrace that?