I think the National Anthem should not be turned into a performance, but rather it should be a deep expression of patriotism. While on the one hand I think it could have been sung a little more plainly, without the quirky, unnecessary ritardo and accelerando, I also think Ms. Fleming did a splendid job in singing the Anthem, giving it her respect and talent without being showy. (Which is more than can be said of many a celebrity who has been given this same honor...)
There is a well-written article on the performance that you can read here.
What did you think?