These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Winning the 2014 Royal Rumble. It really doesn't help that he's previously won one before, and that fans greatly would have preferred the likes of Daniel Bryan, or even Roman Reigns to win. Just his 2014 return in general. See X-Pac Heat below.
On the Devil's Advocate side of the broken base, he still does have fans who feel like he doesn't deserve nearly as much venom as he's gotten. On one hand, they mention how he's appeared more regularly and been much more involved and "in the trenches" than some other recent returns, not to mention how he did help to put over up-and-comers such as Daniel Bryan and the Shield. Others feel like he's merely the flashpoint for a lot of long-building fan resentment at the number of “part-timers:” a dirty-word in the IWC to reference the number of older returning wrestlers who fill up the card and take time away from the current roster. It had been simmering for a while, and he just happened to be there when it boiled over.
Creator's Pet: While Batista was always a Base Breaker due to his backstage antics and being well-liked by management, his 2014 return definitely pushed him over the edge into Creators Pet territory. The 2014 run was likely compounded by the fact that his push to win the Royal Rumble as his first match happened near the same time as the New Age Outlaws having a run as Tag Team Champions despite being (like Batista) out of action for several years. The Outlaws fared much better in terms of crowd reaction (likely because they returned first), but the fact that all three are good friends and former teammates of Triple H made the whole scene reek of nepotism.
Fashion-Victim Villain: One of the things most heavily snarked about during his 2014 return is that his fashion sense is... odd. His preference for skinny jeans is frequently brought up, since they just look weird on a man with his build.
Then there's the blue outfit from Payback 2014. Contrasted further by the fact that everyone else in the ring (even the referee) was clad in black and white or all-black.
Filipinos Love Batista: Justified since he is half-Filipino and is proud of it. He even had the flag tattooed on his left biceps beside the Greek flag as a tribute to his lineage.
"Weapons aren't only welcomed... they're allowed!"
"...stoop! that! low! Duct tape!? Are you serious? Really? Duct tape?"
There was also his trademark ring entrance, which involved him miming the firing of a machine gun (which looked more like he was cabbage-patching) to the tune of Saliva's "I Walk Alone", which has been imitated by some WWE fans.
There was an episode of RAW which showed Batista warming up for his match, then a "fan" comes by and stands in front of him and imitates Batista's entrance. He is then chased away by security.
"JBL, at The Great American Bash... I'm gonna expose your ass!"
He Really Can Act: Regarding Batista's performance in Guardians of the Galaxy as Drax the Destroyer: In spite of playing The Comically Serious character, and being a wrestler that took up acting (which typically doesn't work out, with a couple of famous exceptions), Batista has moments in the film where his portrayal of Drax movingly comes across as an individual that has lost everything and suffered for it. Critics took notice.
Hype Backlash: His return to WWE in 2014 wasn't met with the greatest of reception to say the least; in fact, its arguably one of the worst comebacks in the company's history, and these types of returns are generally met with much approval. See below under X-Pac Heat to see why.
Rescued from the Scrappy Heap: While he was only a Scrappy to a small portion of the audience, specifically the smarks, Batista became a major favorite among that minority after his heel turn. Douchetista: The Bes-tista. This even started to happen again after his return in 2014. At first? People hated him for the reasons you can see under X-Pac Heat below. But as time went on, the man was at least willing to turn Heel (when playing Face was too bad of a cognitive dissonance), tap out to Daniel Bryan at Wrestlemania, and helped put over the Shield at back-to-back PP Vs. During this time, the ring rust started to come off too, and he got really good at the Douchetista schtick along the way. When he left to promote Guardians of the Galaxy, a lot of the same people who hated him at first wished he wasn't going.
An initial reluctance to turn him heel, likely because of the cross-promotion with Guardians of The Galaxy, despite Batista being a natural heel in the past with his "Douche-tista" gimmick, which would play naturally into a "egotistical movie star" return that's been done brilliantly in the past by Wade Barrett and the Miz (and which Miz is currently doing.) This one was later fixed, turning him heel and aligning him with Triple H and Randy Orton as an Evolution reunion.
The other was his push directly into the title picture so fast, winning the Royal Rumble during his first match and getting a fast track directly into the title match at Wrestlemania XXX over Daniel Bryan, who had been Triple H's favorite dog to kick for months and whose push at the time was generally coming across as a "keep knocking him down so his victory is all the sweeter" type of story that would logically culminate at the biggest show of the year. In comes Batista, and Bryan's fans (which was pretty much everybody at that point) led a revolt Batista just couldn't overcome.
Much of the plot wastage was also due to the fact that the way they built hype for his return ultimately ended up undermining the entire thing. His return was heavily announced in January and he had already debuted on Raw prior to the Royal Rumble PPV, meaning the excitement his sudden return would have gotten if he was a shocking surprise entrant in the Rumble was completely killed. Instead, any interest in him had been sucked out because the way they'd announced his return made it so obvious he was going to win and go to Wrestlemania. Everyone knew Batista was going to win the Rumble. Everyone knew it. They telegraphed it from the moment his return was advertised. Spoilers were all over the internet. In fact, his Royal Rumble win was so transparently obvious and so widely known ahead of time that people started believing that it was a decoy and the WWE were going to pull a fake out on it. Batista probably would have been much better received if they'd tried to keep all word of his return as quiet as possible ahead of the Royal Rumble.
Orton: I mean no disrespect whatsoever, but when you left, nobody cared; when you came back, people cared even less. If you would have just lived up to all your hype, we wouldn't be in this situation right now!