Not nearly as bad as the 1 &2 star ratings suggest.

Rating: 6/10 (5 January 2019)

Okay, I will admit that during the first 15 minutes of the film I was shaking my head; there's no way this family could have survived so long under the circumstances. Heaven forbid they had to share an expired can of pork & beans as a meal, they'd all have been dead within hours.
But I let it go, suspended disbelief, and watched. The acting was very good, the premise (somewhat) unique, and the creature, although a conglomeration of a few past sci-fi/horror monsters/aliens we've seen in the past, was decent.
I began shaking my head once again during the scene in the flooded basement, when the creature was lurking within a few feet of mom and the newborn. It was a day later that it hit, (I'm sometimes slow on the uptake). The waterfall scene explained this away. If you could scream and not be heard near a waterfall, the constant sound of running/flooding water in a basement, might be sufficient to prevent the creature from detecting mom's breathing or heartbeat, or even the baby cooing. A bit of a stretch perhaps, but plausible.
You can over analyze this film s many have; the decisions made by the characters or the rationality of the entire premise.
But in the end, while certainly not a 9 or 10, the movie is equally not a 1 or 2 either. In fact, I hadn't realized my 15-year old daughter purchased and watched the movie on Apple TV a month prior.
She loved it. Gave it a 10.