The central problem with this one is that Ma is just not that memorable. The trailer was interesting, and hooked me in, but after it came out, virtual silence. There's a reason for that. Disregarding a few decent performances and some tension come the conclusion, Ma doesn't have that much going for it, and was a definite disappointment.
What are your thoughts on your Ma?
(http://www.fight-evil.com/movies/years/2019/559-1.jpg)