#4 Brock Lesnar's Universal Championship Reign

At Wrestlemania 33, Brock Lesnar defeated Goldberg to win the WWE Universal Championship. Since then, things have spiralled downward for the 'Beast Incarnate'.
Raw has received a lot of criticism for its main event picture. As compared to SmackDown Live, Raw hasn't had a truly reigning, defending, undisputed champion. Lesnar has only defended his title 10 times in his 450+ days title run. He only appears in short bursts and then disappears for long periods of time.
Raw has a lot of great potential talent, but the fact that Vince McMahon treats Lesnar like a huge crowd draw has resulted in the decline of the careers of a large number of Superstars. It seems that the only person that Lesnar seems inclined to drop the championship is Roman Reigns. Reigns is in no way better than Lesnar, but at least we will get to see the Universal Championship every week.
The fact that Lesnar was allowed to wrestle even when he failed his UFC Drug test sent out a bad rep to the rest of the locker room. Add in the fact that he is currently the highest paid wrestler on the roster, it seriously undermines the rest of the talent. It is high time that Lesnar bid adieu to the company.