I can just as easily give it 2 stars, but I'm allowing for the possibility that it's better as a live performance.
Pinter could have named this play What?
, due to how many times his characters ask that question. They come across as either really dense, or as suffering from some serious ADD. He was probably trying to say something with this kind of dialog, but he was too subtle for my liking. It just came off as annoying.
I was struck by the seeming indifference of Emma and Robert to their marriage. The cheating and not caring if the other person cheats smacks of moral bankruptcy and soullessness to me. Though it's probably my own interpretation more than anything Pinter was trying to communicate.