-The Characters. 1
-The art style, and animation. 1
-The plot. 1
-The Music. 0.8
-The voice talent. 1
-Inside jokes and references to pop culture. 0.8
-Nods to the fan base. 0.7
-The all-ages appeal 1.0
The show needs to focus mostly on the things that capture the audience, no matter the age or what they find appealing. If the art style is as best as it can be, with the voices, characters and plot up to the same standards, the show will thus remain, being great entertainment. The music, references and pop culture jokes, I would still like them to be rather frequent and up to date because it gives the show a little color and doesn't make it seem like the animators and writers are just doing a job.
I think I put too much effort into this, I'm gonna go play some dark souls.