Whoever wrote that list is a moron. "My 50 least favorite songs of all time" is a fine title and I can see why someone could dislike everything on the list, but there is no way "50 worst songs" could include more than a few of those.
Don't Worry Be Happy
Two Princes
Final Countdown
What's Up?
Mmmm Mmmm Mmmm
These are good songs, damn it. People who try to classify pop as generally and objectively bad music don't know crap about songwriting.