Octavia Spencer's performance tries to elevate the otherwise-mediocre Ma. 1 / 8
Spencer is magnetic in the lead role, a complicated and bizarre character. 2 / 8
The rest of the cast does admirable jobs, particularly Juliette Lewis and Diana Silvers. 3 / 8
The problem is that the film isn't as interesting as the performances. 4 / 8
The thriller sets up numerous plot elements that it then abandons. 5 / 8
It relies too much on genre trappings to ever be unique. 6 / 8
That's a shame, because it could have been if it committed like Spencer does. 7 / 8
Ma opens in theaters Friday nationwide. 8 / 8