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.
Consolation Award: Some fans have accused the Batman vs Captain American fight as nothing more than an attempt to appease Batman fans who were still upset over his loss to Spider-Man. This is not true however, as many small emergency episodes were planned years ago in case something happened to screw up the schedule, which is what happened regarding Ben's hard drive during Godzilla vs. Gamera, and having to rebuild Tigerzord vs. Epyon from scratch.
"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.
Part of why Godzilla beats Gamera is because his atomic breath is 'pure radiation' and not anything Gamera can absorb. This isn't true. The few times in the series it's been directly stated what it is, it's normally said to be nuclear plasma, something Gamera COULD absorb.
Thor's hammer doesn't actually weigh millions of tons; according to Marvel Canon, it weights a little over 40lbs. It isn't crafted from the material of a dying star; rather, it is made of a magic metal called "uru", and the dying star was used as the forge it was created in. The reason it can't be lifted is due to magical enchantments on it, not the hammer's actual weight.
Wiz and Boomstick glossed over one critical fact that could've changed the entire outcome of Captain America VS Batman: Cap is also known to be able to use guns.
Probably wouldn't have made a difference. Batman handles guys with guns all the time. Disarming Captain America, even if he had a gun, would have been easy for him.
Noin is depiected flying a Vayate at the beginning of Tigerzord vs Epyon. A mobile suit she never used in canon.
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 Killer Instinct 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.
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. Of course, whether this is Hilarious in Hindsight or Harsher in Hindsight depends on whether you are fond of the announcement or not. However, this is mitigated somewhat due to the revelation that the 3DS hardware limitations is what caused this decision to be made, not as a result of wanting to diverge Zelda's character a bit.
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.
After the fight between Batman and Spider-Man, Boomstick comments "And all of Wayne's money, and the commissioner's men, couldn't put Batman together again." As of this edit, Batman is the only Death Battle loser to come back for another match.
Around the same time the show started, The Spoony One made his own Deadliest Warrior-type show known as Deadliest Character, which was only one episode due to the fact that Death Battle was more popular. The only episode was Mecha Godzilla vs. The Megazord with James Rolfe even helping with the Mecha Godzilla section. At SGC's Death Battle Panel and Godzilla vs. Gamera premiere, not only did they state that James Rolfe helped them with this fight, but one of the characters they previewed to be later in another fight was Tommy Oliver from Power Rangers, with his own Zord.
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.
Boomstick: HOLY FUCKING SHIT I DON'T BELIEVE IT! Wizard: OH MY GOD!! Boomstick: SOMEONE GET ME A MOTHERFUCKING TABLE TO FLIP!
The ending of the Goku Vs Superman fight is either this or a Tear Jerker. The planet explodes.
Some of He-Man's more impossible feats (such as burrowing to the center of Eternia with the point of a stalactite) get a "The fuck!?" and a "The double fuck!?" from Boomstick.
Bucky O'Hare getting his head blasted to pieces.
Blastoise ripping off Charizard's wings.
Godzilla Tanking Gamera's Mana Cannon. It is also said that Gamara getting his arm ripped off caused this reaction in a live audience.
The whole Captain America/Batman fight. Steve had a major upper hand for the entirety of the fight due to his superhuman abilities. He curb-stomps Batman for a while, not realizing that Batman is studying his opponent. Once Batman figures out the situation, he delivers quite possibly the swiftest beatdown Cap will ever receive before using his Batclaw to snap Captain America's neck!
Link using Z-Targetting to block Cloud's Omnislash then slashing him mid-air during the final move. Anyone watching that for the first can very easily miss what's going on there. It happens so incredibly fast which is canon to what both of them can do.
Now taken literally with the battle featuring the Big G himself.
In a more Meta way, the vast majority of traffic to ScrewAttack's Youtube page is for Death Battle. All non-Death Battle videos (the majority of ScrewAttack content) get bombarded with people posting suggestions for Battles, asking where the next episode is or DEMANDING the next episode, threatening to unsubscribe if it's not posted, etc.
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.
Ditto Godzilla's... unique style of flight. He uses it to throw Gamera off balance a little while Gamera pushes him into orbit, uses it again to slow his decent into the water after escaping Gamera's Suplex Finisher, and helps determine the sheer force of the atomic breath, almost A Trillion tons of force.
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.
Rooting for the Empire: Lampshaded by Wiz and Boomstick during their liveshow at the convention they showed "Godzilla vs Gamera", where most of the viewers in the audience were rooting for Godzilla even though the fight clearly showed him in a villainous role where he was rampaging through a city.
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. His usually small and pointy finger also looks a little Uncanny Valley-esque and ridiculous as well. 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.
Godzilla vs Gamera looks amazing. The water effects during the battle...not so much.
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.
They did however explain that any abilities for Sheik would apply to Zelda as well due to Sheik being a disguise.
Luigi's Negative Zone had loads of potential, but its "unreliability" (of the eight possible effects, between zero and three effects are distributed at random) lead to none of the seriously debilitating effects making an appearance and affecting Tails; the random effects appeared to be "uncontrollable tripping" and "timeslow from the Stopwatch item", the former of which is negated entirely by jumping/flying, Tails' forte.
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 8 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.
Zechs Merquise could count as well after the events of Epyon vs Tigerzord. Ocular Gushers or not, it's still sad to see him pitifully sobbing over his dead girlfriend.