"Slick" is a great word to describe his work. Sometimes overly slick, in my opinion. I think his best work was on Jersey Boys - it had just the right amounts of grit mixed with glamour. Summer and Ain't Too Proud were essentially done in the same "style" as Jersey Boys, but were far less successful in their executions. His revivals of Guys and Dolls and Jesus Christ Superstar both suffered from being way too slick. His productions in general have a precise shiny sheen to them, and it doesn't always work.
"There’s nothing quite like the power and the passion of Broadway music. "