Saw THE GREATEST SHOWMAN early on and thought it was terrible. Went back to see it when it became a phenomena; I wanted to figure out why. My best guess is that most of the songs are bombastic power ballads of the type that Celine Dion bellows in her Vegas shows. I thought they were awful both times I heard them, but clearly there is a big audience for such overhyped melodies.
Each song started soft ("I am slow/I feel so low") then built to a huge life-affirming wallow ("I'm gonna eat the world!/I'll eat the world!"). Terrible stuff, like the Oscar-nominated howlers that Diane Warren writes each year for the movies. Far better scores (RENT, ITH) have fallen on deaf ears.