BroadwayConcierge said: "It is only currently rivaled by “Hygge” in Frozen."
I have to say that I immediately thought of that song as well. I can't believe that Disney hasn't tried to come up with a better number that that since it opened. It is atrociously bad (and I didn't hate Frozen -- I found it mildly diverting, if mediocre).
There are so many candidates for worst. Some of the shows were so awful, and the songs so instantly dismissable, I wouldn't waste my time even thinking about them. Re generally good shows, I would certainly ask everyone to remember some of the filler songs in Billy Elliott, especially those early in Act 1...I don't even remember their names; I just remember wondering why so much colorless filler so early in the show. I also think there are a couple of real clinkers in Wicked, particularly the one with Dr. Dillamond (I have blocked it out, so I don't remember the title).