I am late to the party, but I just now watched it for the first time. Yeah, it's often silly and childish, we knew about that even before the film came out. Sacha's topics change throughout the different movies, his style doesn't, and I'm okay with that, I get plenty of laughs from his stuff.

But I guess the biggest plus besides its entertainment value is the message that lies behind all the stupidity. While you would think the movie would mostly make fun of dictators (which it sure does on many levels) it manages to pose a mirror to our western society, too, most prominently represented by his final speech, where he talks about the advantages of a dictatorship over a democracy, while in reality it is clear that Sacha Baron Cohen talks about American politics instead.

He won't change the world with his movies and I think that was never his intention, he wants to entertain people, but Sacha is a smarter man than most people give him credit for. You can like or dislike his kind of humor, but I have respect for everyone who speaks his mind and doesn't hold back just to reach a bigger audience, even if it is "just a comedy movie".

In the words of the great General Aladeen:
"It's my way or the hifaelalmatafalaidschaolakaouramag way!"