The main problem with “Mama” though is that in terms of story, it’s the same old shit that we’ve seen in every other paranormal flick out there. The only parts which leave an impression- the weird attempts at humor and the sudden transition from horror to fantasy- only stand out because they don't work.
"Sinister" doesn't push any boundaries, nor will it rejuvenate horror movies. But it is one of the better examples of its kind and if every ghost-thriller was this good, I wouldn't be complaining about how similar they are.
It is very cheesy, but I adored that. The goofiness mixes in with the terror pretty well, creating a morbid, camp classic that also happens to be spooky. It's rare when a movie can make you shiver and laugh at once.