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.
YMMV: Death Battle
Accidental Innuendo: When Wiz is discussing Peach's "Vibe Scepter", Boomstick begins laughing uncontrollably. Not that he can be blamed.
Bucky O' Hare's theme song. Even Boomstick gets into it.
The music played during Taizo Hori's character overview is super catchy as well.
The fanmade songs created specifically for Death Battle. These include "The Book of Ivy" and "Chemical Bath" both created by classic-black-and-green for Ivy vs Orchid and Luigi vs Tails, respectively.
Broken Base: By the show's very nature, it's essentially impossible to definitively confirm which character would win in a fight. Therefore, at least some fans protest the results of most fights, much like in Deadliest Warrior.
Not too many fans were fond of Sektor being chosen over other Lin Kuei cyborgs. Even Boomstick agrees that Cyrax would have been a better choice.
The robotic Sonic that appears in Sonic the Hedgehog 2 for Master System, and the robotic Sonic that appears in Sonic the Hedgehog 2 for Genesis, are two different robots. Only the former holds a Chaos Emerald and is called "Silver Sonic"; the latter is called "Mecha Sonic" in the Japanese manual.
"Kunoichi" is a term for female ninja, not Distracted by the Sexy, but this is understandable since the latter was a major tactic employed by the former.
In the Teenage Mutant Ninja Turtles, Michelangelo is often stated to have the most potential as his overcomplicated weapons prove he's Brilliant, but Lazy instead of Too Dumb to Live, and he's also Battle Nexus champion, but neither of these facts are brought up in analysis. Interestingly, the character Wizard hates Michelangelo but the annotations of the first Q and A video reveal that Ben and Chad actually prefer Mikey over the other turtles.
The hosts claim that Shao Kahn is immortal because of all the souls he keeps stealing. While he can and does steal souls and likely would have defeated M Bison regardless nothing in the canon suggests that this is the source of his immortality.
In Marvel continuity, Thor's hammer Mjolnr only weighs 42 pounds; the dying neutron star was used as the hammer's furnace, rather than what the hammer is actually made of.
Some of Boomstick's No Sympathy related quips during and especially after the fight can be...off-putting, even more-so if your preferred character loses, it'll feel like a second kick to the gut.
The 'Vegeta vs Mewtwo' video just comes off as a petty and meanspirited dig at another series for no real reason.
The 'Bieber vs Black' fight might as well be called 'I hate teen pop stars so I will vent my hatred by killing them all' best shown in the ending where the Jonas brothers and Miley Cyrus ended up being killed in the crossfire for no reason other than petty cruelty or trying to please the haters.
Ear Worm: The short little sting that plays right before the finishing blow during "Luigi vs. Tails".
Ensemble Darkhorse: So the video with the most views is Goku vs. Superman. What could possibly be the next most viewed video? There are so many good choices! Why it's Goomba vs. Koopa, of course!
Death Battle previews for the He-Man and Lion-O fight seemed to imply that Lion-O's ability to control cats would be used on Battle Cat, which had some fans complaining that Death Battle was essentially breaking its own rules to give Lion-O an advantage in their fight. Needless to say, the actual battle made quick work of that little issue.
Pikachu and Blanka never once paralyzed each other, either through electrical discharge or through Pikachu's Static ability. The match was made before Gen VI, where Electric-type Pokemon became immune to paralysis.
When discussing Superman's strengths and weaknesses, it's stated that "even the buildings in Metropolis are more valuable to him than his own life". One of the main complaints of Man of Steel was the amount of damage to the city.
In the episode that pits Fox McCloud against Bucky O'Hare, Wiz describes the latter's nemeses of Toad Empire, "as amphibian Nazis... if Hitler was Skynet." The episode that comes after? The Terminator vs. Robocop.
Ivy vs. Orchid only a few days before Double Helix revealed a sneak peak that Orchid would be in their Killer Instinct game for Xbox One
Mario vs. Sonic came before Short-Factor started animating. As a result, Luigi and Tails' fight is far more visually spectacular, though that was animated by someone else.
On May 19 2014, Goku and Superman had a rematch... in rap form.
After the Goku vs. Superman fight, Bookstick happily exclaims "It's over! It's finally over! We never have to hear about it again!" Cue the Internet Backdraft. Boomstick might've just been talking about hearing about the "Superman VS Goku, who would win?" debate. That is over. It's the flame wars discussing the fight that are new.
One of the most common complaints about the Peach vs. Zelda fight was that Zelda never transformed into Sheik during the fight. Come Super Smash Bros. 4, nearly two years later, Sheik has been her own character slot instead of being part of Zelda's moveset, meaning that Zelda literally CAN'T turn into Sheik mid-fight.
Though "hilarious" might not be the right word for either episode, Blanka biting Pikachu's head off was later attempted by Charizard to Blastoise Chariard's attempt failed, and loses his wings (and life) as a result.
On the day the May 16th death battle, which is Fulgore vs. Sektor happened, immediately after it, Godzilla was announced as the next fighter in the next death battle. This becomes even more amusing that not only did the death battle come out the same day as the Latest film, but in said film, Godzilla kills the bigger muto in a way that would fit right in Mortal Kombat itself.
HSQ: Almost every episode has several potential moment for this, the most notable are:
Eggman vs. Wily, especially after Metal Sonic decimates both of them.
in-universe: Boomstick Lets out a big "OH SHIT!" after seeing Mjolnir's raw power in action.
Superman vs. Son Goku; even the hosts can't contain themselves.
Now taken literally with the upcoming battle featuring the Big G himself.
Love It or Hate It: The Goku Vs Superman fight, depending on which side you were hoping would win. It's by far the most controversial fight in the series.
Any episode can be this, really. Supes vs. Goku is just the prime example. Likely from how highly requested the match was, and thus how popular it is.
Misplaced Nationalism: Thanks to the victory of Superman over Goku, many enraged Dragon Ball fans are accusing Wizard and Boomstick of having an American bias. Even though non-American characters/non-American created characters have defeated American/American created characters is previous battles. Boba Fett vs. Samus, Haggar vs Zangief, (possibly) Felicia vs. Taokaka, and Fox McCloud vs. Bucky O'Hare, for starters.
These accusations have also been made by Japanese viewers watching copies of that particular episode on Nico Nico Douga. In particular, one person mocked the victory with a "USA! USA!" comment.
Ron the Death Eater: Superman after Goku vs Superman. He's treated as a monster by some because his battle with Goku caused the Earth's destruction, ignoring the fact that Goku both instigated the fight and escalated it; Superman was minding his own business and tried to talk Goku out of fighting twice.
The sprites of Fox McCloud were clearly not vectorized properly in Eric Marte's animation software, resulting in ugly streaks of grey either at the edges of his limbs and face, or surrounding the entire sprite. Thankfully, the choreography is just as strong as ever.
Some of the things on Robocop are occasionally Off Model. Parts of his model were highlighted poorly in some shots (like when he and Terminator are on the rooftop) and any level of proper lipsyncing was either cut for time or just ignored. Still very well done fight overall.
During the Battle Amongst the Flames that occurs during the Pokemon Battle Royale, the wall of flame is clearly made out of separate pieces, causing unevenness in the heights of the fire. A good example can be seen right before Blastoise starts pumping water into Charizard's mouth.
Bass' Super Mode is only used in a futile attempt to stop Metal Sonic from going One-Winged Angel, when he was the only Robot Master strong enough to take him on.
In Shadow vs. Vegeta.
Super Shadow spent most of his time teleporting Super Saiyan Vegeta around via Chaos Control, which ultimately led to his undoing.
Shadow never gets to use Chaos Blast, only a failed attempt at using it just before his energy runs out.
Paralysis is brought up when listing Pikachu's moves and abilities, but it never makes an appearance in the actual fight.
Zelda Vs. Peach: No Sheik mode for the former.
Luigi's Negative Zone had loads of potential, but its "unreliability" lead to none of the seriously debilitating effects making an appearance and affecting Tails, merely a trip negated by flight and slowed speed negated by a bomb planted earlier.
Visual Effects of Awesome: Several of the Death Battles can apply, but of note is Thor vs. Raiden. Every coming battle will be this, due to their new animator, Jordan Lange, who started animating the series as of Zelda vs. Peach.
Goku vs. Superman. It's fully 3D, less polygonal than Link vs. Cloud, and the attack animations are amazing.
Robocop vs. Terminator. Besides the lack of lipsyncing, the animation is EXQUISITE.
The Woobie: Luigi and Tails are probably the two most pitiable combatants in Death Battle to date. Luigi is in a perpetual state of fear and never has his accomplishments recognized, while Tails had his parents killed mere minutes after his birth. Putting the two of them in a fight to the death feels horribly wrong. Luigi loses some Woobie points for trying to kill an 11 year old, but that last scream of his is chilling, and there's a Wild Mass Guess that he's doing this out of grief-induced madness over his brother's death. Not only that, but Tails must now live with the fact that he had to kill a man at such a young age in order to survive.