I've watched most of Perry's plays and all of his movies, except for the new one which I will probably watch this afternoon. Just reading over some of the comments, I wanted to throw in my two cents.
I think that Perry does use some stereotypes. When white people, way back in the day, created or popularized these stereotypes of the mammy (Madea) and the coon (Brown) for example, they weren't just restricted to white people for their enjoyment. Black people were also exposed to these images and in many instances those, and other stereotypes, unfortunately shaped their own world view and self-images IMO.
What I think Perry has done is to take something familiar, and slide a message of personal responsibility, faith, and empowerment underneath it. His movies can be moralistic and preachy at times, but he's saying something that a lot of mass media isn't or in a way that doesn't bludgeon his primary audience. For me, you laugh with Madea, not at her, which is a difference than creating a mammy character that is a joke, and not part of the joke, or a familiar vehicle to get to his social message.
I also think that Perry shows more diversity in the African-American community than he has been given credit by some in the forum. Many of his movies show a range of black people at various levels of society. Most movies only show one class of black people-generally the underclass or the upper middle class, if they show black people at all. He uses broad comedy as a method to get people into the theater. I think many of his movies cover the same territory, but as one of my friends said, maybe people need to hear the message more than once.
It makes little financial sense for Perry to change his formula right now if his formula is working. Despite that, I think he is tinkering with that formula though with Daddy's Little Girls, The Family That Preys and Why Did I Get Married? Daddy's and Preys weren't based on previous plays. Preys also was more of an interracial drama/woman buddy picture and he's going to do a sequel to Married, the sequel not being based on his plays and also continues his forays into drama.