how do you evaluate a director's work?

I have been reflecting on my reactions to theatre that I see. As an actor who has yet to tackle directing, I realise I generally look at things from that point of view. My observations re: lighting/set design/sound are generally minimal - unless it is particularly amazing or dreadful. Sad I know, but true. As to the direction of a show, it is a similar thing for me; unless someone makes some very different thematic/interpretive/stylistic departure from the expected, I don't tend to notice & the lucky actors get all the credit for a great show. To me it would seem that if a director has done a good job, no one will really notice, as the show will flow smoothly, tell the tale effectively & captivate as it should. Just wondering - how do you evaluate a director's work? What are your thoughts on this, folks?