I have to say, this series is a guilty pleasure for me. I know I shouldn't like them, but I do. The horror aspects of them have a very intimate feel while building up subtlety.
The third iteration in the series I think nailed it. There wasn't too much downtime, and things weren't over the top like the end of the second.
All in all, I'd recommend you guys check it out while its still in theaters, unless you have a badass sound system at home.
There is the most succinct and spoiler free review ever.