He was as wrong as the day is long. To this day, I still laugh at many of their cartoons. Hanna Barbera made many a Saturday morning for this old kid. I turned my son(11) onto these old toons and he loves them. He also loves the Threes Stooges. Clean, slapstick humor.
Besides, it sounds like the reviewer, whose opinion you seem to agree with, wouldn't know childish humor if it bit him on the ass. Cartoons written for kids that adults could find humor in as well is a mark of genius.
Sounds to me like someone doesn't like to laugh and depart from reality for a short while.
RIP o'Grand Masters of Toondom. Thank you for all the years of laughter. You will be missed but your works will live on.
SZ
I guess I was raised on better things like real animation.