As an actor, it's always important to understand what the director is after. That, to me, is my job. When I'm acting, I like to ask a lot of questions and understand exactly why the director is doing what they're doing, so that I can provide him or her with the ingredients that they need to get the scene that they want. It's not to challenge them, in any way. It's just so that I can do my job best.
I enjoy a challenge or provocation, something to think about, to talk about after it's done.