#2 Worst: No interference from Ambrose
I mean let's look at the facts. You had Seth Rollins dress up as one of Dean Ambrose's henchmen last week on RAW and take the fight to the Lunatic Fringe. You also had the Intercontinental Champion cut a promo before the main event, talking about the match.
Therefore, it defies all explanation why Dean Ambrose would not want to interfere in the Corbin vs. Rollins match, logically. The match in itself was good and it is clear that Corbin operates at a much higher level now than he once did. But the match did nothing to further the Rollins vs. Ambrose feud at all.
Having Dean Ambrose interfere in the main event would have left fans with a cliffhanger and created heat between Rollins and Ambrose. Unfortunately, it was not to be.