DC just keeps rushing into things lately. no plans, no prototype, no back up, no patience. they rushed the reboot and it was and is full of holes. and now they are rushing the JLA to film.
The Avengers worked because it was a pay off, Marvel did right by having faith in their work and the patience to play the long game. with Marvel all the characters that need a solo introduction had one before they all came together.
all of the DC characters are varied and miss matched enough that they each need room to breath at first. you can't rush the Flash, GL, WW, and Aquaman in during an info dump by Batman. at least not in a live action movie. it will be rushed. it will be flawed. it will be awkward. and it will make money despite itself. it wont be getting mine though. DC has no faith in it's work anymorw and neither do I.
and how did we get a Howard the Duck movie before a Wonder Woman movie? come on DC/WB. act like you know what to do.
I think the problem with the Riddler is that he is smarter than the writers. Paul Dini even said the reason they didn't use him much in Batman: The Animated Series was because they had a hard time coming up with good riddles and schemes that didn't make him look ridiculous. it takes a sharp mind to understand a sharp mind.