@RobZilla:
Interesting, why do you dislike him?
The first thing that annoyed me about him was how he was talking about Doflamingo and the others.
I am aware I am biased because I ended up liking Doflamingo (and the family) so fucking much, but seeing someone from a group that see each member as a family "badmouthing" the others and trying to backstab them was not a good thing (it would be if Rosinante was portrayed as a bad guy, but that's not the case).
It also goes against him the fact that he should be the person to understand Doflamingo best. Even if he disagrees with Doffy and takes upon himself the responsibility of stopping him, calling him a monster, not human, saying that he can't understand how someone like that could come from his kind parents, etc etc, all while trying to use Doflamingo's confidence to betray him… fuck you, man.
Obviously, if Oda shows their past with Rosinante trying to stop Doflamingo is less shady ways and showing Doflamingo as someone really deserving to be hated by his brother up to that point, this can change, but as far as it is, Rosinante doesn't come out looking good in my book.
But what really made me want to puch this guy in the face is what he did to Law.
FFS, I understand him doing it wrong in the first hospital, since he wasn't expecting such a negative response, but keep repeating it over and over again? Every time forcing Law to see others treating him like a monster, forcing this kid to go through this?? He couldn't simply leave Law outside and go there by himself, tell the doctors he had someone with the amber lead disease and only if they were willing to treat the said person, bring Law inside?
There are many times in OP we see characters acting in stupid ways but we ignore it because what matters is the message that Oda is trying to convey (like Bellemére's decision), but this time it was a bit too much to me.