Personally that's a streangth for DC as all under one stable should give them more continuity and control. For some reason though DC have never tried to use this streangth and instead seem to refuse to use the bigger picture with their movies. We just end up with a collection of movies (and TV shows) from DC which are stand alone and where the charachters have no connection to each other rather than all existing in a single universe.
Maybe DC should create a "DC Studios" (similar to
"Marvel Studios") with WB to control the film adaptions
of their properties.
Also, creating a hugely over-budgeted "Green Lantern"
flick was a mistake. Instead, DC/WB should have created
two lower-budget films based on, say, the Flash
and Green Arrow. There would have been a greater chance
of this model being successful at the box-office and thus
setting in motion a franchise of DC films that don't
one of the Big Three (Supes, Bats, and Wondy).