I think the most absurd fight was Tatsumaki vs Mob only because the creator of both those series outright confirmed how that'd play out and said Mob would win if he was playing serious while Tatsumaki could defeat normal Mob, and then the fight shows him getting serious but loses anyway because reasons.
By far the worst thing to come out of Death Battle is the emphasis on visible feats and parading them as "science", especially in the dubious context of which most of those feats are applied. Let's look at Hiei vs Sasuke for example.
So assuming Death Battle really does pick a character as the victor before they do anything else as
@Tism the Return stated, the team went to bat for Hiei and worked from there. Problem is, because they use feats literally in every scenario, they had to look at Sasuke's "slicing the moon" feat and had to justify giving their victor a bigger number, which gave them the roundabout, vague scaling bullshit they went with in the actual fight.
Problem I have with this is that looking at feats basically forced the show to ignore what these characters are actually capable of because they take many of them too literally. Who cares if Hiei or Sasuke can crank out the bigger number? What they don't mention nearly at all is the fact that Hiei is a
demon. And in the context of his show of origin, being a demon grants several innate abilities and physical/psychological differences that sets them apart from humans. To me, that fact, as well as what that kind of inherit advantages that grants, is far more important than whether or not Sasuke sliced a moon since, again, taking feats literally, Hiei is a breed of creature that fights in a plane of reality that is hardier than the Earth, which the series states someone like Hiei can destroy. Earth > Moon. But look at how boring that is. It ignores the fighting styles of both characters in favor of a bigger number without highlighting what people actually like about them and their fights.
And the same can be said for almost literally every Death Battle.
No, Megaman.exe is not unfathomably faster than any character ever; You misinterpreted the context of that entire series just to give his feat a hard number to follow.
No, Ben 10 is not vulnerable to surprise attacks; You misinterpreted the rules of the show to give Green Lantern a win condition that he really didn't have.
No, Sub-Zero is not canonically punching through titanium; You just have this bizarre tendency to pick and choose which feats are canon and which are not.
Death Battle's analysis rarely ever hits the mark and while I do still enjoy it on a casual level, their tendency to jack off imaginary science to justify their decisions is actually really fucking annoying, especially since to this day there has never been an instance of the crew admitting that their outcome was wrong.
...still substantially less annoying than the Powerlevel fags on YouTube, holy hell that is a special breed of autism.