Mama has a really unique plot, and some really impressive and creepy camera work, though some of it's biggest problems, I find, are it's script, which goes all over the place and into confusing territory, and it's editing. I'd find that the characters would be doing one thing, and they would show up in another part of the house, or in another area all together.
Over all, this movie didn't really frighten me. There are some very creepy shots, and some effective jump scares, but Mama shows too much of it's antagonist by the end.
I was fairly let down by this movie, but it did have a nice tone throughout the entire movie, and, like I said, some incredible cinematography. I'd recommend the watch if you enjoy good old scares and a unique plot. 7.5/10