I've read the comments, and the point still stands. There's a reason that I had never heard of a "weirdtopian" novel before. If something is outside of the scope of what humans are capable of, it's very jarring to one's suspension of disbelief. Just because it fits with his desire to make it weirdtopian doesn't mean I like it any better.
But isn't the basic idea that, through genetic engineering et al, we can become a species other than our own? I can't fault a science fiction story for showing the possible sociological consequences of scientific progress, no matter how much I don't "like" the direction science or society is taking—that's the whole point of science fiction, after all.
People like to have protagonists with "human" values to root for in stories—in fact, it can be said that consuming narrative is basically how humans indulge in pretending to believe their own far values (by identifying with characters that act on those far values as if they were near, and then "liking" the works of writers that cause those identifiable characters to "win" the story—or, alternatively, that cause characters without those values to "lose", as in tragedies.) That's the reason that any setting, no matter how fantastic (D&D, 40k, HHGTTG) still has (something that acts and thinks like) modern-day humans. However, if you really think in Hard sci-fi terms, you begin to realize that there's no good, probable explanation for "the future" being such a setting without further, conscious intervention on our part to retain our current values (see Eliezer's "Theory of Fun" sequence.)
I'm not sure it's possible to argue someone into enjoying a work of fiction.
I explained why it didn't work for me. Any work of fiction- the successful ones, anyway- will always be about people. If they're too different of a people (genetically engineered out of their humanness), then people simply won't enjoy it.
There's a reason that there are virtually no popular science fiction novels where the protagonist is an alien that has a completely different value/mating systems to us. I got like a page into a story about an alternate history of Earth where birds resembling jacanas (a species where the females are behaviorally like the males of other species and v.v.) were the intelligent species on the planet. Then I realized that no-one could ever relate to or care about my characters. They were just too alien. That isn't to say there can't be great fiction where the conflict between alien races is over that difference, like 3 worlds, (Ender's Game comes to mind), but the point is always to reaffirm what it means to be human. You just can't do that if the humans in your book are alien.
I'm not suggesting that you should enjoy it. It's not escapism; it's not intended to pass mindlessly into your amygdala. It's meant to be a serious, critical analysis of the consequences of doing such a thing—a satire, in other words. you're meant to come away with it with an opinion on whether or not doing this—becoming alien in this way, having these irreconcilably different values—is a good thing or not.
...which was, oddly enough, the plot of the story itself! The protagonists decided that the values of the Baby Eaters were a bad thing; and, likewise, the Super Happy people decided that the values of the protagonists were a bad thing. One day, our future, alien selves might decide that our current values are a bad thing, and, likewise, if we see their (potential) values as bad enough, we might consider not allowing such a positive feedback loop toward new values to take place at all.
Except (spoiler alert) the central conflict of the story is that the humans don't even remotely want to go through that kind of change, even though it's scientifically possible. Which means that you have biologically stock humans who are allowed to rape each other, not futuristic bioengineered posthumans who just happen to not mind being raped.
It wasn't even an especially important or relevant part of the plot. It's not an unusual, or especially heinous sin for SF to be tone deaf about how actual human beings function, but supposing that any kind of peaceful society would allow rape is pretty absurd.
