I think Akainu being handsome is joke by oda . Seem no serious fanbase or other character view Akainu as handsome. Akainu is famous for killing Ace and end up most hated character in one piece fandom. The manga and other fans portray Akainu as angry man. Eruption volcano are theme as rage.
Oda really loves the jawline and thus facial bone structure of Bunta Sugawara, the actor Akainu is based on though. I'm certain he was sincere in that as he made Akainu look as much as possible like him and plenty of influences in his design and such from the actor's movie roles too:
https://pop-onepiece.blogspot.com/2014/12/a-tribute-to-bunta-sugawara.html
In the succeeding decades Sugawara continued to work steadily in both films and television, including voice roles in
Hayao Miyazakiโs 2001 Academy-Award-winning animation โ
Spirited Awayโ (2001) and
Goro Miyazakiโs 2006 hit โ
Tales from Earthseaโ. By the time of his death, the โ
Battle Without Honor and Humanityโ series was widely recognized by Japanese critics as a post war masterpiece, while Sugawara himself had become a tough-guy national icon, similar to fellow Toei star Ken Takakura, who died on Nov.10.
Eiichirล Oda wrote some deep words toward this sad event, and he promised to continue drawing
Akainu with great respect:
"Bunta Sugawara, the greatest-looking guy in the world with the best bone structure. Rest in peace. I have no words. I will draw Akainu with great respect."
Eiichirล Oda
I don't think Oda cares if people idolise Akainu and find him handsome, hes paying tribute to an actor he truly loves and admires and I imagine it would only make him much happier if Odas gave him the same respect and admiration ofc!
I've seen Akainu pretty well received outside of here too tbh. He'll always be an "underdog" due to being an "old man" but also the one who killed Ace and thus a lot of Luffy and Ace stans will hate him for that naturally.