Badmouth Tyler Perry all you want (and trust me, I had to be dragged into a Madea movie initially as well), but the man's funny. Sorry.
Madea's the kind of person who carries a hammer in her purse at all times because you never know when you're gonna have to fuck a motherfucker up and it just might be a police officer. That's the kind of character I can hang with.
There's a moment in the film where The Rock is returning Kevin Hart's letterman jacket, Hart asking where The Rock found it and the reply is "I sleep in it every night."
There's where the real movie is. This should have been a straight thriller where The Rock is an obsessed sociopath in love with Kevin Hart. Could have been really dark, really funny and a little bit upsetting - think Observe and Report.
But that's not this movie, unfortunately. See it for The Rock.