Their IPs have been used to make some good media outside of comics…
Well, correction, Batman has been used to make some good media outside of comics. There’s Nolan’s Batman trilogy. There’s the Arkham games. Batman has had at least two good TV shows, especially Batman: The Animated Series. Even Teen Titans, Justice League, Justice League: Unlimited, and more recently Young Justice have milked Batman either directly or through Robin.
I guess there’s also Static Shock, but that wasn’t originally with DC*, and even when DC acquired it they, you guessed it, made sure Batman got a few appearances.
* OK, I guess it was indirectly, but the TV show predated DC’s more full integration of Milestone Media’s heroes into the DC universe.