I don't think that Death Battles is a stellar example of video game entertainment, but at the same time they are sort of ok. Really I just like it whenever they do a fighting game character vs. fighting game character episode because that kind of episode actually makes some sort of sense. Any other type of matchup just doesn't make sense to me. The commentary itself suffers from what I would call the ScrewAttack/Machinima syndrome of YouTube gaming videos that is easily identifiable by a complete detachment between the nature of the content being presented and the tone of the commentary, usually sounding like it's trying way to hard to play things up in and be ridiculous in videos that are actually more educational than anything else, and doesn't sound honest, organic, or even remotely close to being unscripted. The only group/production company that makes videos like ScrewAttack or Machinina that I have enough respect for to be subscribed to is RoosterTeeth, because while Achievement Hunter occasionally release videos with downright stupid commentary, at least they don't try to razzle dazzle anyone with it And about the flamewars, the amount of time I've on YouTube and the rest of the internet has left me well prepared to not care at all.
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Nosce te ipsum - Know thyself