The overall genre I'm talking about is "sf/f cop show," by which I mean anything sci fi or supernatural, anything with a law enforcement angle. There's just too much of it, considering what's being ignored: SPACE OPERA! Why can't we get one space opera? Why does sf/f always need to have a law enforcement angle? The lack of imagination just rankles me.
My colleague Dave Mack offered an interesting hypothesis to me a while back: that viewers seem to respond more to shows about characters working to help solve other people's problems than they do to shows about characters dealing only with their own problems. So the formats that perennially succeed are ones about characters whose jobs involve helping others: cops, doctors, lawyers, detectives, superheroes.
After all, what gets on TV isn't a matter of imagination alone. It's about what viewers want to see, what gets a large enough audience to be profitable, or at least affordable, to make. And the bulk of what works with a mass audience tends toward certain norms. The trick is to find a way to be creative within those norms.
And I have to disagree with you here; I haven't read
Powers, but I think the idea of doing a show that's set in a superhero universe but focuses on the ordinary cops within that universe is definitely an imaginative idea. It's not automatically unimaginative to use a familiar format like a procedural, if you find a fresh way to use it. A lot of people assume that something has to be all-new to qualify as imaginative, but really, most imagination is about taking existing building blocks and finding new ways to put them together. Most superhero stories focus on the superheroes' perspective; what's imaginative in that context is focusing on the civilians who have to deal with the consequences of living in a world of superheroes. Something like
Damage Control, Gotham Central, or
Powers. Heck, even
My Super Ex-Girlfriend was imaginative in concept, if mediocre in execution.