Creative was never behind Ziggler like they should have. Dude has gotten red hot multiple times in his career, with the right push he always gets the crowd behind him, but for some reason Vince never committed to him and just shot him down way too quickly so it killed his momentum dead in its tracks. If you don't think that's the case, look how red hot dude was coming of Survivor Series '14 and winning the IC strap back from Luke Harper, only to have his run killed almost immediately so they could set up a 7 man (seven!) feud into WM.
Same thing happened with his feud against the Miz. They built up the whole career vs title fight great, had a very good match that had the whole crowd behind Ziggler, and then they job him out so fast that it kills his momentum again. You can't fight against shytty booking like that.