Garp’s great (feels like people still don’t get him) and I’ve enjoyed the flashback. Neener neener I don’t care what the haters think. You can all get Galaxy Impacted.
I think the reason most (including myself) Garp haters see him as mid is that in a series all about *strong wills*, Garp doesn't really have any strong convictions. His form of justice, "My Justice," being charming but arbitrary.
Or because he's so willing to
1) be the dog of the state
2) aim his greatest passion and effort at the least important kinds of targets (chasing Roger > all else is not justice, it's just fight addiction)
3) leave corruption and injustice alone even as he states it plainly (Garp says "Tenryuubito are trash", Fujitora drops a meteor on Marie Joias at the first sliver of plausible deniability)
--"Ore no Seigi" (my justice) becomes really uncompelling, and unimpressive.
Compared to a character that has a very similar "justice," Rurouni Kenshin's Kenshin Himura— who has the same "protect those in front of me" posture, but couldn't be more different from Garp in mental. Kenshin is constantly grappling and over-thinking, Garp never wavers or hesitates(*ASTERISK); holds clarity+action regardless of consideration as a virtue.
Comparing them though, at least Kenshin has the self-awareness to understand that his justice is flawed and his internal demons and internal grappling with his flaws and weaknesses makes him more human; and compelling. His self-awareness makes him act deferential to characters like Okubo Toshimichi genuinely committed to genuine transformation and progress.
(though real world Okubo--not manga Okubo-- was REALLY authoritarian in real life, and it would have been much much much MUCH better if Kido Takayoshi had greater grip on the helm+Shinsaku/Ryoma hadn't died— the Choshu leaders & Tosa Ronin were much more progressive than Satsuma's Okubo and Saigo)
Garp constantly strutting and acting like he's right.
But I'll say that his best moments
are in deference to characters he senses have genuine moral vision and internal self-strength to lead towards change (sacrificing himself to save Koby from blackbeard, who he saw defy Akainu at Marine Forde; taking it upon himself to free Dragon, and affirming the importance of Dragon's Justice for the world).
Probably though, the biggest distinction here is that at the apex of his strength, Kenshin TRIED to (and actually DID) use his power and his personal justice to challenge the system itself, and transform it. Sure, Okubo's Meiji Japan eventually evolved into a terrible fascist state (after bringing in a bunch of German consultants on industrialization...), but the Meiji Revolution itself that Kenshin sided with was about eliminating the caste system, overthrowing the absolute authority of the Shogun, and uniting disparate fiefdoms into a unified Japan— all genuinely revolutionary goals.
^With that as background, Kenshin's retirement and retreat into forgetting the systemic, focusing on the local/individualistic, and holding his imperfect justice along with saddled trauma is— well,
it's earned.
At the peak of his strength, Garp sipped drinks pool-side between bouts of... chasing Roger around?
Now I get that Moral clarity isn't supposed to be the core of Garp's character, but without a passion for Justice his *conviction* feels mid, because Justice is supposed to be the whole thing Marines care about.
Garp's most meaningful role in the story is to be a COACH— all of his strongest, most noblest acts are as mentor. To Aokiji and Koby he teaches "don't hesitate." To Luffy and Ace (the "D" boys for whom not hesitating is 1st, 2nd, and 3rd nature) he teaches the importance of strength.
To Dragon we could say he's taught— "You're not wrong. The world is shit, and if you want to change it— you're a better man than me."
^So that's the crux. Garp is a compelling coach, but only a coach of POWER (so only compelling to power thirsters), and without actually accomplishing anything really meaningful, that "coach" role feels a lot more hollow. Reyleigh is a more compelling coach because
he actually went to Laughtale.
The argument ins't that Garp is a bad character— there are almost no bad/non-compelling characters in One Piece. That said, compared to:
-Koby, who's seen the corruption of the system and is still "looking for his own justice" even meekly
-Fujitora, who despite being blind is the MOST clear-eyed marine in commitment to "Justice for the people", and revolution from within
-Dragon, who is the character representing "True Justice," a revolution of, by, and for the people
Garp
is mid. The argument is not that Garp is bad, or not charming, or uninteresting— just that he's extremely mid.