I don't really know. I guess with Marvel, they haven't really given us a superhero show per se so they don't have to sacrifice anything from the cinematic world to TV. They gave us a show primarily about non-powers with cameos but unlike DC, they haven't given us a show about a B-List superhero or A-List in the case of the Flash and Smallville. Like if they did a DC Science Police TV series or Gotham but in a present time setting or Checkmate or CADMUS or ARGUS or even a Daily Planet TV series.
Heck, SHIELD's characters are all original to the TV/cinematic universe with even Nick Fury only making brief cameos on the TV series. SHIELD to me is more along the lines of if WB did a show about Suicide Squad with Rick Flag, Jr., Karin, Hugh and Jess (while unknown to the casual watcher is still a lot more than what ABC gave us with Coulson, invented for the movie, and an all made up for TV team) with occasional tie-ins with Amanda Waller and King Faraday from the cinematic universe with Deadshot and Bronze Tiger on cameo duty.
In this case, I'm happy to keep things separated if that means I can have a TV series about DC's A and B listers like Flash and Arrow that are substantial because they don't need to save all the good stuff for an upcoming two hour movie. Not that I'm saying there's anything wrong with SHIELD's approach. I love SHIELD.