The Spectre is the Avenging Wrath of God. Unless you change the origin completely you can't depower the character without taking away from that aspect.
You don't need a Spectre to have Superman powers to be the wrath of god.
And yes DC has many street level characters but there's always been a Batmanish influence on nearly all of DC's other non powered heroes (in some shape or form) that they're nearly not unique enough.
Batman does have an influence. He's an arch-type. They all do that. Spider-man's one as well. That influence has been used in shows like Kim Possible, Buffy and Ben 10 with success. Batman was an influence in Angel, too.
Exactly what are getting at by characters not being unique enough?
All they need is a cartoon, tv show or movie to do a good job adapting them.
Nolan has succeeded with his take on Batman because he's using the character and his world to comment on ours like Miller did 20 years ago.
Film makers can do that with other franchises, too.
DC (and don't get me wrong I prefer DC to Marvel) ultimately is the home of Godlike heroes who are expected to be lighter hence why it is easier to make great drama that resonates with everybody using Batman than it is with Green Lantern.
That doesn't mean they can't be relevant, serious or dark. It just depends on the character and what the story's tone is. Some have more depth and darkness then others. Some can do both like WW.
Some franchises are lighter then others, of course but there needs to be a balance. They're not the Super Friends. Far from it.
Not all comic book characters are equal
You've under-estimating comic book characters potential.
I know all characters aren't all equal but in the right creative hands they do have potential to be entertaining.
(something some fanboys don't understand)
You may not like fanboys but they can see potential where others don't. If it wasn't for us seeing that potential many of the great stories and characters in comics wouldn't have been created in the first place since in the comic industry many become those creators. We don't need to see a good movie, cartoon or tv show adaption of a comic book to know a franchise has potential in those mediums.
There are many great stories and characters in comics most people just don't know about since they don't read the comics.
Some of us even find work in other mediums like Hollywood. Del Toro and Riami are fanboys who had the skills to show the potential of the comics they read on the big screen.
Fandom isn't limited to comics, either.
in terms of potential great storytelling, relatability
Batman is not the only hero who can be relatable.
He's just the one WB does the best job showing it.
(partially why despite being an ultra handsome millionaire the character has succeeded over the years)
They don't need Batman level success to do that.
Batman didn't even have Batman level success in the beginning. It took many generations of work to accomplish that.
Comic franchises come in many tones just like any other medium.