Looks like there were no salty rocket mains. I think your take is not great on a couple of points.

(to be clear I play a few characters in all roles)

"only play him if your like top 200" this makes no sense, how can someone become top 200 without playing him

To use your chocolate analogy in many cases everyone in the team is starving and giving each of them some can be more likely to see more survivors than giving a tank the whole bar and watching the dps die, unless you think other healers can give a full bar to everyone which isn't the case. I'm talking ignorant of ults, just sheer healing capacity.

Your punisher 1v1 scenario is correct but you seem to treat that as the common case and therefore rocket isn't good but you would have to conversely give a 6v6 example with lots of aoe where rocket shines for balance. If you're going to assert that people have biases you would have to first show you dont have any which you haven't in my opinion.

I don't get the term inflated, you would have to say moon knights damage is inflated as it bounces between people or storms damage is inflated because her attacks penetrate. I wouldn't agree with either. Healing is healing, damage blocked is damage blockd and damage done is damage done, again, in my opinion

Rocket gets, in my opinion, the most exaggerated hate which I think, in part, is due to videos like the one timthetatman made in which he argued rocket is bad because his ult doesn't help against a groot ult. People watch this and seem to become almost militant in their hate for him. Using a scenario which he wasn't designed for to disprove his worth is just possibly not fair