I don't know about the reaction to the match itself, but last year the talk was about the Sami turn and some degree of unpredictability on whether they'd capitalise on his over-ness.
I think the problem they have is that the Wrestlemania main events have been set ever since Punk return, and they're trying to sell us about five months worth of filler to get to that conclusion.
Without Cody's mania title shot on the line, what on earth stakes does Elimination Chamber have now?
That is a huge part of the problem. Back before the internet/dirt sheets and betting odds. the matches for Wrestlemania were not as known, before the Royal Rumble. It’s a part of the problem. Back in 2005 where Cena and Batista “won” they were both over, both destined to win their respective belts, but you had no real clue as to who was going to win. On smackdown Cena had been built up for a while, JBL had the belt for a long time, on Raw was HHH holding the belt and evolution.
Another example is the John Cena injury return, it wasn’t ruined by book makers or the dirt sheets trying to one up themselves. The best Rumbles are the ones where it is a total surprise, currently every year, there is a kofi spot, some one lasting less than 5 seconds, having an Ironman effort, a build up so a certain wrestler can clear the ring. A winner that everyone knows is more likely to win, as it’s been posted about numerous times what the main event of Wrestlemania is going to be. This has really been a thing since Cena vs the Rock 1, where the following day after that Wrestlemania it was already being built up as the main event of the following Wrestlemania.
so take away the suspense and the anticipation and replace it with predictable outcomes, the event itself becomes obsolete.