#1 Batista's return in 2014
It wasn't Batista's weakness that he was treated the way he was by WWE fans at the 2014 Royal Rumble event. The WWE's creative team who must take the blame for how hard the return failed.
The creatives were aware that at that time if anyone other than Daniel Bryan won the Royal Rumble, the WWE Universe would be displeased. However, WWE chose to overlook that point and made Dave win the whole thing.
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The whole run had been a disaster for Batista. He came back looking disinterested with no passion in his promos and it seemed like there was no gas left in him. The fans immediately turned on him.
His own babyface moment was shattered by these circumstances. He was booked in an awkward spot, at the wrong time and at the cost of a more conventional hero. In other words, big Dave was completely troubled by WWE. If Batista had returned doing great promos and having great matches like he hadn't lost a step since 2010, we wouldn't be having this talk.