See, I had the reverse effect with the bolded part. When I heard that JGL and Marion were rumored to be in the movie at first, I was extremely nervous. Basically because of one fact. Name ONE comic book movie where there are three big-name villains in it that's any good.
There aren't any. And to clairify, I'm talking about MAIN villains, not side villains. Yeah, BB and TDK had lots of villains, but guys like Gambol, Chechen, and Maroni weren't main villains. They were supporting characters. I have yet to see a superhero movie done well where it has more then two main villains and one of the villains doesn't suffer from under-exposure.
The closest I can think of is Batman Returns, but even then, I thought Bruce Wayne/Batman suffered in terms of screen-time, and there weren't many supporting characters in the film because of it. Added to the fact that Shreck was an original character, and he didn't require the extensive amount of backstory Batman's main rogues gallery does. But it's probably the film that's done it the best.