The funny part of YF for me was that other than Christopher Fitzgerald, I thought everyone else's parts were fine, but not sensational. IMO, he was the strongest performer of all. When I attended last week, it wasnt' until Fitzgerald's curtain call that part of the crowd got on their feet. I guess that's what Brooks was going for, the show being able to survive without major star power.
Of all the roles, Foster's will be the easiest to replace, followed by Bart's. Bart does not have a strong voice or dancing ability, but his comedic timing is strong but can be replaced by a dozen or more actors. Guess Brooks has the last laugh!!
The only review of a show that matters is your own.