I stayed at my sister-in-law's place for Christmas a few years ago for a few days and there wasn't much else going on in the evenings. She insisted that we watch Shitt's Creek.
I was inititally a little irked that I was being forced to watch it, and I didn't like the characters for the first couple of episodes (yes "the kids").
I disliked them slightly less during the third episode, and as time went on, I started to understand them and it got better from there on out over the next couple of episodes. In the end, I enjoyed it and grew some affection for the characters. Pretty sure they are written as deliberately flawed / unlikable from the beginning, but there is a lot of growth.
Maybe it's just not your thing, but my take on the show is that it is one of those where you will be rewarded for the time that you put into it.
Yes, the Catherine O'Hara character is amazing.