For all people slag LiS, the final season of Voyage to the Bottom of the Sea beats it in the stupidity department.
I know we're comparing personal taste of "crap vs crap" but Voyage never plumbed the depths of pure idiocy LIS did. Okay, maybe the Leprechaun episode, but LiS wallowed in children's theater for the majority of the second season and a lot of the third. I think the fact they essentially made that series a comedy made it more palatable. But for the most part. Voyage took their stupidity seriously. I'd take the Abominable Snowman over pink dragons with hair ribbons any day of the week and twice on Sunday. And I say this as a fan of Irwin Allen's work.