Few movies manage to integrate rap skillfully in my opinion. Especially bad is RZA's 2012 movie
The Man with the Iron Fists. I don't think you can achieve a more boring movie than this. The music feels like someone vomited all over the place and called it making use of a soundtrack. The tracks are not bad, mind you, just used inappopriately to generate an eye-gouging feeling of boredom and confusion.
*looks at thread title* Sorry, seems I am in the wrong thread.