I actually think they're fun. They shouldn't be considered even as much as fodder for 1:18 collectors, they're just novelty Pop items as intended.
So far I've only gotten the non-George BTTF figs and Jules, Vincent and Gimp and don't plan on buying many, but they're simply funny to have. May get Heisenberg, I didn't realize it was out. My coworkers seem to love them, and they don't seem to much care for toys.
I even got one of my friends at work the Gimp. He was stoked to get such a fucked-up "kid" toy. I don't see these as any different than Funko vinyls.
Now, I won't be opposed to them making more realistic ones, but these aren't geared for us. And I'm fine with that.