I thought it was a great episode. Lots of suspense: Is Jon going to die? Is Beric going to die? Is Tormund going to die? Oh my, look who just died!
All that to capture a single wight. To paraphrase Saving Private Ryan, that had better be a real special wight - like it had better discover the cure for cancer or something.
So much for the idea of the three heads of the dragon and the three dragon riders.