It's the poster child for awful preaching, complete with Gary Stu & Mary Sue heroes and villains that are so 2D that calling them 2D is almost an insult to all other 2D villains that exist. And of course Wheeler was the stereotypical misguided American that had to be taught the error of his ways the most often.
I will also never forgive "Population Bomb," wherein Wheeler learns via an it-was-all-a-dream adventure that families with more than 1-2 children are pretty much a blight on the Earth that will consume too much and destroy civilization if allowed to go unchecked. Wheeler wakes up realizing that wanting a big family of his own was just wrong and selfish! And in the dream world, a ruined faux-Earth is overpopulated by talking, anthropomorphic mice. Real subtle. Quite frankly the message is revolting, and it was a hell of a guilt trip to play on a not-insignificant number of watching children that are a part of a larger family. Sure, preach good stewardship of the Earth. Fine. My contempt is unlimited for anti-human crusading.