You mention your suspicion that WM30 might be better remembered, but I'm not so sure. Every Wrestlemania season, 31 finds its way into numerous top 10s and best-of lists, and it's baffling. Sure, the ending was amazing, but is it really that great as a show overall?
Nearly every match featured an established WWE guy going over a newer talent (Cena, Triple H, Orton, Taker, even freaking Big Show in the ARMBaR). Even the new WWE champion Seth Rollins jobbed earlier in the night and then won on little more than a fluke. WM31 could have been a passing of the torch to some of the younger stars, but other than maybe Rollins, no torches were passed, and nobody got anything out of this show.
So why do/did people love it? Was it only because expectations going into it were so low and it slightly over-performed? Did the closing image of Rollins' victory stick with people and convince them it was great? What gives?
How can ANYBODY defend a show featuring that Triple H/Sting bullshit?