I enjoyed the National Anthem this year, however it was not flawless and not without embellishment. Most people do not know that the NA should be sung and played "smartly" or at moderate to quick tempo (that's how the colors are raised - they are only lowered slowly for taps). I believe she sang the song in the key of C, that means the highest note would be a G (she embellished to get the two high C's in there). And last but not least - they should have used a mezzo soprano because the beginning notes start below the the bottom of the treble clef, and she had problems with those (kinda pitchy - but recovered well).
We tend to listen for what we like - all I heard the week before the game was "we'll finally get someone who can hit the high note" or the news interviews "are you going to hit that high note". I listen for the entire song - and Flemming's rendition is in my top 5, but my number one is still Houston, because even if she sang with a backing vocal track (she had no background singers) - it pretty much stayed with the written music (except for tempo) no embellished high C's (that are not in the song), and her range - low to the highest written note in the has better balanced than Flemming (Flemming can go higher than Houston but can't go lower, and the song doesn't require you to go beyond Houston's range - which was still crazy high).