Which "Mature" titles are actually immature?

[TopCat8]

If a game is immature, it's immature. It doesn't matter what rating is given to it. Just because an M rated game capitalizes on blood or boobs doesn't make it any more immature than a game like Wario Ware. There are plenty of intellectual, stimulating, and mature M rated games out there just like there are plenty of silly, pointless, mind-numbing games that are rated E. The M rating and the word "Mature" don't really mean the same thing in this case.