I've never seen it that way. It's ridiculous because it serves a story purpose to be ridiculous -- it shows how shallow and decadent the Platonians are, how much it amuses them to humiliate their slaves and force them to act ridiculous, and how twisted they are in that they see the subjugation of other people's minds and bodies as something frivolous and silly. It's that contrast between the frivolity of the Platonians' perception of their actions and the horror of its reality that is so damning to them and so chilling to behold.
Okay, granted, maybe it went on longer than it needed to in order to make that point. But it had to be a lengthy enough ordeal to set up the scene where Kirk, McCoy, and especially Spock were dealing with the psychological aftermath -- which was the most effective scene in the episode. And it was just the prelude to the darker stuff the Platonians planned for them later, including an orgy of rape and torture that network standards required interrupting before it began. If the Platonians devoted that much time and effort just to making their new pets sing and dance and clown around, imagine how long their more extreme ordeals would've lasted if our guys hadn't figured out the kironide thing. There's a terrifying undercurrent that, to me, legitimizes the absurdity.