In fact, I think "Gang Bang" has something to do with that song that we've heard about a lot of times, "Bang Bang"... how would it be just a coincidence?
As for GGW, it's catchy. I like it better than GMAYL. It sounds like it has more international appeal too (GMAYL's UWC debut is disappointing by Madonna standards: http://www.mediatraffic.de/tracks.htm).
And yes, of course it's beneath Madonna. But judging it as a pop song irrespective of who's singing it, it's catchy. I could imagine Pitbull singing this "girls gone wild, put them fingers in your mouth, open up your blouse and pull that g-string down south" but his songs are catchy...