I do think she's underrated to a degree, and I don't know if we can necessarily blame the Super Bowl fiasco for ending her pop career, but something seemed to go wrong with her career after her divorce from Rene Elizondo. I know a lot of people over the years have alleged he was a big part of her music when they were together and there's been a noticeable change ever since they separated.
She had a great string of music videos and pop hits, but she never really got the same type of attention, global fame, and media domination that Michael and Madonna got for much of that same era.