M A M A... I just like to say that for some reason! Maybe it's because I'm from the South! It had its creepy, disturbing moments for sure. Between my two girlfriends and myself we certainly screamed and were plenty grossed out. I don't think however that qualifies a movie as "quality."
The best part of Mama was when I went to the bathroom and came back crawling on the floor "Navy Seal" style and scared my friends to death! (Luckily, we were the only ones in the theater and neither of them has a heart problem!)