Sabody showed more than enough of that. Luffy made light of things that overwhelmed him before and haki'd things, etc. Sanji couldn't even touch the Pacifista before, and this time he broke its neck with just one kick. Zoro cut up a FREAKING GALLEON. Fine with all of that, it was a mini-arc. Rather than that, I don't think you should use this nonchalant beat-up-everything-effortlessly idea at the height of an arc, since it was a fight ridden with political tension and backstory that somebody probably enjoyed (not so much me).
When I saw the use of ancient, forbidden steroids mentioned, I was hoping this would make the fishmen actual worthy opponents, and yet they were still fodder. Jimbei by himself could probably have put a stop to much of the problem. Hell, the entire driving force behind the villains was mindless hatred. Mindlessness isn't the villains' forte, that's LUFFY'S FORTE.