Since the title refers to a post of mine, I will first address that I wasn't talking about every critic out there but those who were pushing things like exchanging non-contact waves of black sparks as peak fighting quality (which is what I was answering to).
Secondly, as I already addressed, you can dislike this Gear as much as you want, but not only fits both Luffy and the core tone of the story perfectly but, and this is more important, it's what the narrative behind this fight asked for. Kaido is a depressed, angry man who noticed Luffy would grow stronger the more he smiled, was expected to be Joy Boy by King and mumbled about his rival not being it either. Focusing on the tone of the fight is narrow-minded because the actual clash here is between Joy Boy and that who failed to be him, between joyness and depression, between wanting to live and wanting to die; and, in this particular context, what we're seeing is great.
So of course not everybody disliking Gear Fifth is an edgelord, but let's not pretend that many people in here even like what One Piece is about instead of the most generic version of it in terms of shonen tropes; the same kind of people who truly believe, without feeling embarrassed, stuff like "Zoro should be the main character". Other than that, there's a lot of fear for the whole fight (and incoming conflicts) to lack seriousness, but not only isn't this the case (last chapter feels way more balanced with the actual interactions, from addressing those important for Luffy's journey till Kaido, understanding that the emperor will kill everybody if he isn't defeated there, Kaido cutting Luffy's crap by either biting or blasting him...), but I personally doubt Oda will be dumb enough to reduce fights to cartoon action. Luffy is experiencing his new powers and Oda needs to stress the joyness in Nika's ability, let that sink and I'm sure everything will work out in interesting ways (just think about it: Blackbeard can nullify the fruit and he himself represents darkness; Sakazuki can erase joy out of Luffy just by the fact he traumatized him by killing Ace; and Im, if they end up being the final villain, shall be Joy Boy's antithesis).
Finally, goofiness has always been there; in this case it feels like there's more of it because Oda needs to emphasize the feeling of "liberation" (as I explained in the spoiler thread, you guys must understand Luffy as a rubber ball bouncing crazily) the character is experiencing right now, but it can't stay like that forever because, in Luffy's own perception, it's pretty much killing him. But I'm thankful Oda ran away from haki, which is arguably one of his worst additions (at least in terms of handling) and in this particular case was killing everything Luffy's style was about (how do you even like a rubber man focusing on not touching? He's rubber!). But Gear Fifth? It's pure rubber hose animation that takes full advantage of Oda's own personality as an author (since he's clearly influenced by old animation from Disney to Fleischer and works like
Chitty Chitty Bang Bang or Terry Gilliam's movies more than anything).
In other words, try to not be like this for once: