This generally goes for Shakespeare more than other playwrights. Apparently directors feel as though, since the play has been put on for a few centuries, they must do something "new" and "different."
Usually this seems to involve grit and poor lighting. And a Iago who talks into a barrel very quickly the whole time, so that you have no idea what he's saying. Also as much nudity as possible.
Why would you do this to the Bard? What has he ever done to you?
Modern dress doesn't bother me. Victorian dress doesn't bother me. What bothers me is inscrutably insane theatrical choices that make the play difficult to watch. Come on, people. Your pretentious artiness is making everyone else miserable.