I've learned, having been on a lot of sets, the good news is that by definition you are surrounded by experts. They get fired if they're not - unlike in the theatre!
Unless comedy touches me as well as amuses me, it leaves me with a sense of having wasted my evening. I go to the theatre to be moved to laughter, not to be tickled or bustled into it.
Sometimes we go to a play and after the curtain has been up five minutes we have a sense of being able to settle back in the arms of the playwright. Instinctively we know that the playwright knows his business.