I watched the halftime show just now on youtube..and while I really disliked Lenny K during the intros..I disliked Rhianna way more. Apparently, a lot of people liked it..I did not.
But, you want to talk about her sex appeal or the scandalous nature of her songs, I think its legit. While Umberalla isn't a scandalous song (its just annoying..eh..eh..eh...annoying..eh..eh..eh), Rude Boy, only girl in the world, what's my name..all had pretty obvious sexual undertones in the performance and in the lyrics.
I'm not sure its worth causing a fuss about, but it ought to bear mentioning. Of course, Janet Jackson's superbowl slip wasn't exactly family friendly either..