I think the only criticism was along the lines of "Well, that's great for the kids. But the poor parents! What in earth were they thinking?!" not realizing that the parents got a different kind of break in addition to doing something wonderful for the children who all got to spend like eight whole weeks at a lake house instead of just two and got to do it with lots of built-in friends to play with, rather than being lonely on an adult vacation away from their friends.
I'm not saying it's bad. Just that the part that was good for the kids was different from the parts that were good for the parents.
People here saying "That sounds glorious" about 50/50 custody arrangements strike me as thinking about it from the point of view of how the parents experience it and not how the children are likely to experience that.
Everything I've read suggests that shuffling the kids back and forth like that ends up being distinctly negative for the children in most cases.
Reading some of the comments here, I'm reminded of a story I read about several couples renting a summer house, sending all the kids from all the families there for the summer and the parents taking turns spending their vacation there to supervise.
Some outsider was like "Oh, God, spending my two weeks of vacation tending to so many children sounds like a nightmare." And then someone pointed out that for the parents, the vacation was the other six weeks or whatever getting to live like a childless couple.
(Please don't aim your anger at me. I'm on your side here.)