#1 Having Brock Lesnar drop the Universal championship at Summerslam
Brock Lesnar is a part-timer. He should be used as an attraction. However, Vince McMahon decided to put the top championship from RAW on the former UFC champion. That turned out to be a horrendous call as Raw saw a drop in ratings as well as attendance during the episodes without the top championship. Furthermore, this was a sign of deep disrespect to the full-time talents who work for more than 300 days and not get a single title reign.
Brock was expected to drop the title at Wrestlemania 34. However, due to crowd's negative reaction Roman Reigns, the creative decided to postpone the coronation of Roman Reigns to Summerslam when The Big Dog conquered The Beast become the new Universal champion.