Here's a great article on Lady Gaga, deconstructing all the reasons why she is, in fact, not that interesting.
In my own beardy rockist opinion, it all comes down to the choons. If she was pumping out great pop or disco, I'd say the all the other stuff (which I'm inclined to like) is just cream. As it is, it's like getting a present that's beautifully wrapped, but there's nothing in the box.
In the meantime, Grace Jones's version of Nighclubbing is stuck in my head today.