The Louvre has all the potential to be a great museum but it terminally spoilt by the crowds wanting to see it.
You can bypass the outside queue with a Museum Pass but inside there is a huge crush to see the "must see items" such as the Mona Lisa. Flashes everywhere, (apparently it's not permitted but no one was enforcing this) pushing and shoving to get to the front. Awful.
We abandoned the Sully wing where the main attractions are and had a pleasant tour through the Richelieu wing which was much less crowded.
I'm going way out on a limb here suggesting that Paris has many many better things to see than this.
On a final note the audio guide, based on a Nintendo with more buttons than the Starship Enterprise, is hopeless. It purports to offer a GPS guidance system but we just could not make sense of it as it does not orient itself to your direction of travel. All it says is you have left the route do you want to recalculate but then offers no guidance on which way to go. If you can stay on track it is worthwhile but no good for getting back onto it.
On to the Centre Pompidou which is far less crowded and has a superb collection of 20th century art.