TOD - I could write forever on this topic. But to keep it personal, here are a few thoughts.
I actually love Legally Blonde from a musicians stand point. The books are fun to play, but yes, a lot of it sounds the same.
Shows I shake my head and wonder "WHY" - Shrek, most juke box shows that aren't Mamma Mis, Jersey Boys or Beautiful
And the three that I think are interchangeable because they all sound the same Book of Mormon, Spamalot, and Something Rotten. These three are all male voice heavy and all have the same vocal sound. I'm tired of that sound. I do love Spamalot, but you can keep the other 2.
Thank goodness for things like Fun Home and the new Come From Away to break the overly commercial mode of Broadway today.
Then there's Hamilton - in a category in itself, much of which IMHO is personal hype that seems to make it better than it is.