it is a must to visit, go early to avoid big crowd of peoples. and be careful of some pick pockets outside the Louvre area.
Louvre is a very big museums, in total it feels like there are 10 museums in one place! Make sure you plan your route well, as it is so big, to see everything maybe you will need about 3 days! So, I would suggest just research which arts that you would really want to see, so you will save alot of time. Outside the museum is really beautiful too. Don’t forget to visit this attraction if you go to Paris.