It's getting very high ratings, has some good, family friendly (albeit sometimes juvenile) humor, even has nice, if not rather simple, lessons about humility, relationships and family in most episodes. The characters are pretty good, though some have been explored more than others, but that's supposedly going to change in season 2 with more focus on looking into each sister's personality more.
As a grumpy fuck who hatse most modern cartoons, I've actually really enjoyed it. It's nice and grounded, and doesn't try to be more than it is. It's a comfy, simple, sometimes relatable, sitcom-y cartoon about a big family. It's a good palate cleanser.
Also Leni is an adorable doofus and they milk that fact at every opportunity.