Discussed in-universe when its found out that in order to make a Super Saiyan God you need six benevolent Saiyans pure of heart, with one receiving energy from the other five, Roshi brings up the fact that while Goku is a nice guy his intense love of combat brings his benevolence into question. Piccolo outright scoffs at the gang's chances, thinking they only have two pure-hearted Saiyans around in Gohan and Goten.
Is Beerus really as evil as his status as antagonist suggests? Let's take a look at his crimes: He humiliated King Vegeta in front of his son, and tried to blow up Earth.Pretty evil stuff. Except... Harsh as it may sound now, King Vegeta was also an Evil Overlord and an overall horrible individual and his son wasn't much better at the time so that bit of humility was well deserved. As for destroying Earth: Sure, Beerus says that he's going to, over very petty stuff such as not being invited pudding no less, yet he constantly keeps delaying, holds back his power with Goku during their fight to allow Goku to get a hold of the Super Saiyan God transformation, and even decides not to destroy Earth in the end. One wonders if he was ever really serious about it in the first place. Also, he did destroy some planets, but it comes out more like a sort of Blue and Orange Morality. Sure, the reasons he does it are a bit petty, but he's a God of Destruction after all, so destroying planets it's kind of his thing, and it's not driven by malice or hatred. The sequel even confirms him as a True Neutral.note However, Dragon Ball Super made him more malicious. At first. Then he becomes a Jerk with a Heart of Gold.
Base-Breaking Character: Beerus. Some people thought having the God of Destruction at the top tier of the power scaling hierarchy was fitting. Others find him far less interesting than other antagonists, as well as being annoyed by his jerkish attitude and how he gets away with anything as there's no one to put him in his place.
Crazy Awesome: Beerus. Used King Vegeta's head as a footstool in front of his own son Prince Vegeta while making him treat him to an Eight-Course Banquet, curbstomped Super Saiyan 3 Goku with a single chop on the back of the neck, used chopsticks to defeat Tien and knock Piccolo out with pressure point attacks, defeats Super Gotenks by spanking him, effortlessly defeats Vegeta with a single pressure point attack to the forehead and also one shot all the other Z-Fighters including Android 18, Ultimate Gohan and Majin Buu. Oh, and he also needs the sounds of multiple bombs exploding continuously and simultaneously just to wake up.
"Funny Aneurysm" Moment: Goku jokingly stating that they should probably let villains slap Bulma to get Vegeta stronger becomes cringeworthy in Dragon Ball Super, where a villain kills Future Bulma, traumatizing Future Trunks as well as pissing Vegeta off enough that the latter finally goes into Tranquil Fury.
Germans Love David Hasselhoff: No matter what way you look it, the numbers that the movie did in the Latin American countries is nothing short of remarkable. As seen here, in some countries, it debuted as the #1 movie in the box office. That's a major achievement for Short Anime Movie based an franchise that is nearly thirty years old and hasn't had a movie since 1996.
Harsher in Hindsight: In Dragon Ball Z, at the end of the Buu Saga and after defeating Kid Buu, Vegeta wanted to destroy Fat Buu because he saw him as just one more disaster waiting to happen. If he had destroyed Buu then and there, Beerus would have been able to sample some pudding and not threatened the Earth. This is later subverted as, if Beerus simply did leave peacefully, Goku would have never achieved Super Saiyan God, impress Beerus and Whis, and would have been very underprepared for the events of Dragon Ball Z: Resurrection ‘F’ and Dragon Ball Super.
Internet Backdraft: While Battle of Gods was a relative success, there are some fans who had issues with the film. Mainly having to do with the fumbled continuity of character ages, Videl's convenient pregnancy, the Mai/Trunks Ship Tease, Super Saiyan God form, and that the movie is supposedly canon.
It Was His Sled: By now, it's pretty common knowledge that despite achieving Super Saiyan God, Goku does not manage to defeat Beerus.
The way they get Goku into Super Saiyan God Mode is getting all the Saiyans to take hands and form a circle. Crowned with getting Videl into the Ring-a-Round Rosie because she's pregnant.
Visually speaking, Super Saiyan God Mode itself is also not that impressive: It's just Goku with red-velvet hair and lighter eyes with a different color glow, plus it seems that his musculature actually decreases, which is really puzzling for a power-up. Some fans alleged that Toei just wanted to sell off surplus Dragon Ball Kai merchandise, and the easiest way to do so was with possibly the laziest Super Saiyan design ever.note As is becoming a trend with reactions in Dragon Ball Super, Toriyama was responsible for the desgin. Possibly lampshaded by Piccolo's reaction.
Never Live It Down: Beerus's desire for pudding is swiftly becoming his defining trait among some fans. It's not helped by the rant he goes on about it to Gotenks.
Nightmare Fuel: Beerus. Whenever he awakens from his slumber planets will be destroyed, maybe even for petty reasons... And there's nothing that can stop him bar Whis, who isn't entirely reliable. And in case one says it had been said the same of Majin Buu, we see him smacking Buu around with embarrassing ease.
Popular with Furries: The very moment Beerus was introduced the furry fandom almost immediately latched into him. Even those who don't like, aren't interested in, or are actually fans of but didn't have anything related to their fandom to talk about Dragon Ball immediately began to like him.
Videl's pregnancy could have been used as a Character Development arc for Gohan (and in some extent also how it could have affected Piccolo or Goku's character at the prospect of becoming a grandfather) instead of being just another Plot Convenience.
Even Vegeta's character arc could have been explored, since we can see how personal his fear of Beerus is, instead of just being told about the potential danger he is for any world in the Universe.
Basically every popular voice actor from the All Star cast reunited for the film. Then only 20% of the cast get any dialogue.