I dunno... I really enjoyed walking through the Hall of Mirrors. Obviously that experience alone is no where near the entirety of the Louvre, and I wouldn't suggest heading out to Versailles if you're only in Paris for say a 5 day trip, but I'm glad I went on my 11 day trip a couple years back.
We somehow managed to get to it with relatively few people. The rest was 100 people per square centimeter, multiple tourist groups fighting for the same spots, more crowded than a Tokyo subway in peak hour.
Though I've heard it's much better if you manage to get there at opening time.
