#1 Brock Lesnar
Brock Lesnar is definitely a pro in the ring. He is a great wrestler, and his nickname 'The Beast' really suits him. I really like him as a wrestler, but not as the Universal Champion, and I am sure many will agree with me.
Brock made the Universal Championship his toy and would only defend it when he pleases. He only defended it 13 times despite holding the title for 504 days. His contract stated that he may not appear on all the episodes of Raw, and was also not bound to defend it in all the pay-per-views, and he took complete advantage of that.
There was a time he did not appear on WWE shows for 3 months, and that really made fans angry, and they preferred anyone over him as the champion during that time.
Although many do not like Roman Reigns, at least we now have a fighting champion. Lesnar is again going to have a match for the Universal Championship at Saudi Arabia's Crown Jewel in November. Lets just hope he does not win the match, otherwise we would have to sit through another long and painful reign.