I haven't watched for a few reasons. Firstly, the dry-humor of the leads isn't funny to myself. Secondly, the title is misleading.
The title typically refers to a first-gen immigrant new to the USA with little to no English spoken (for that matter, it could be referring to Africans, Asians, Europeans, etc). But it's usually directed at Asians for some reason.
So the family depicted could not be "fresh off the boat", because they are already immersed in American culture. I have an Asian friend who introduced me to the word FOBbish. The term doesn't bother her, but her sister detests it.
Anyways, the show would be worse than it is if the characters actually spoke in broken English. Having said all that, more diversity is sorely needed on American TV, because this is a weak offering.