Ok, I gotta choose my words carefully here..
I'm quite sceptical about how routes get so thouroughly trashed by a lot of people here so often. I'm not saying there aren't times I agree. But that's mostly about there being a better route to climb up a particular mountain.
My 20-ish years of watching this have made me learn that the route, in the end is just a canvas (horrible clichés are just that for a reason, sorry).
It's the combination of the field of riders, the way they ride it, and just pure luck and happenstance shuffling the GC that decide if a GT was great or not.
I know its fun to pick apart a course and how it could be better, but really, the route overall isn't such an enormous factor as some people make it out to be.