You guys slay me. Every time a comic book film has more than two or three characters (hint: every movie, period) you all start fussing. Do you guys ever, you know, watch movies? Do ever actually consider the number of important characters in them?
I mean, you don't watch The Empire Strikes Back and complain that Boba Fett and Lando make the film too crowded, right? Nor do you say "They shouldn't have recycled Obi-Wan's ghost!" When you sit down and watch Return of the Jedi, are you thinking "Jabba, Boba, Vader, the Emperor, too many villains!"
The bottom line is that a film feeling crowded actually has nothing to do with the number of characters, and everything to do with the writer. If the writer is incompetent, the film will feel crowded. If the writer is not incompetent, it won't. Fanboys have this ridiculous idea in their head that because BF and B&R had multiple villains and failed that all comic book movies with multiple villains will fail. I'm sorry, but this is plainly stupid (much like the belief that Robin automatically equals failure). Those films were crap because the writers were idiots. End of story. Great films have multiple villains all the time. Open your eyes.