Not at all, if Batman movie is going to have Catwoman half of the film it's going to be great. Besides, you simply can't have a good super hero movie without a heavy involvement of supporting cast of the said super hero, because they all play their parts of the protagonist forming himself as a super hero. You can't have Teenage Mutant Ninja Turtles without April or The Last Airbender without Katara, just like you can't have Superman without Lois Lane. Otherwise it's going to be a very different kind of Superman and will get a big part of fans of the character feel alienated, you know, like New 52 did in comic books.