Donaire is in his 4th weight class now, and he's already 29. He's beaten Darchinyan, Maldonado, Mthalane, H. Marquez, Montiel, and Vazquez Jr. His Flyweight resume was solid, all of those fighters were in the Top 10 there at Flyweight, and Darchinyan was Top 10 P4P at the time. Hernan Marquez was an alright win, but he wasn't even in the Top 10 when Nonito beat himand it was an interim title. Montiel was a really good win at 118, he was Top 10 P4P. Still, there were so many other fighters at 118 he didn't fight (Perez, Agbeko, Mares, Moreno, etc). He still has chances to get some of those on his reusme though, so we'll see. And Vazquez Jr was Top 10 at 122 by default I guess. He's never beaten anyone and got TKO'd by Arce in his only step up.
His resume is lacking for being 29 and going through 4 weight classes.
By the time someone like Floyd was entering his 4th weight class, he'd beaten far better fighters. He'd beaten G. Hernandez, Manfredy, Gerena, G. Vargas, Corrales, C. Hernandez, Chavez, Castillo, Corley, Gatti, and Judah. Genaro was the lineal champ at 130, the best SFW in the world. Manfredy was the #1 SFW contender in the world and had just beaten a prime Gatti prior to fighting Floyd. G. Vargas was a Top 10 SFW at the time, was coming off beating Tackie, who would go on to have fights with Tszyu, Mitchell, and Hatton. Corrales was the #1 SFW in the world and #5 P4P, unbeaten. C. Hernandez and Chavez were both Top 10 SFW's and would on to win titles, and fight Morales. Castillo was the lineal champ at 135, coming off beating Bazan and Johnston, would also go on to have more good wins in his career, the best LW of his era. Corley was a Top 10 JWW coming off a close loss to Judah. Gatti was the 2nd best JWW in the world, coming off wins over Leija and Dorin, held the WBC title. And Judah was a Top 10 WW at the time as well, though he was coming off a loss.
When comparing to Donaire to the point he's at his career, to other great fighters, his resume is lacking for the amount of hyope he receives.
dont forget H. Marquez moved up to fight donaire