31 had:
-a satisfying main event. Like Brock/Cena before it, Brock/Reigns wasn't really a good match. It was a satisfying match because they let this fucking monster just stiff the FUCK out of their new "guy", which no one expected. Plus Seth cashing in was an awesome moment. Match is worse in hindsight because suplex city is played out now and Seth's run went nowhere.
-a really cool rko. Can't take that away from the show. It was great.
-the cluster fuck hhh/sting match that made no sense, hhh went over for no reason, but was full of nostalgia so it was kinda fun if you don't think about it too hard.
-the rock bringing in Ronda rousey. Cool at the time. Watching it back today.... lol
Overall I didn't think it was a great show then, and it's even worse today considering how they followed it up.