I tried that as well. For example, I am attempting to use ui.bootstrap.modal on a page, which I shouldn't have to inject since ui.boostrap is already declared in app.js, but if I do I hidden elects are shown, CSS goes crazy, etc.
In the case of the bootstrap modal, if I don't inject it in my controller, the modal CSS is applied to the buttons, but the modal isn't hidden upon page load like it should be, and button click events do not work.