Bryan winning the belt at WM30 is perhaps the worst moment in the history of pro wrestling. The viewership leading into WM that year were down from the previous year most weeks. His title reign tanked viewership as well. After he left the viewership went up thanks to Evolution. The Summer of 2014 had better viewership than 2013.
The best WM main event is Hogan vs Savage. Undertaker vs Batista at WM 22 is also a classic. Austin vs Rock at WM 17 was great as well.