Paris is lovely. It's a big, busy international city so yes, it's crowded and can be grubby in places - just like London or New York or Rome (fewer cats that Rome, though).
It has world class art galleries - anything from the the classics and renaissance at the Louvre through Impressionism at the Musee D'Orsay, the lovely house and gardens of the Rodin Museum, the most ingenious way of collecting taxes that resulted in the Picasso museum (to avoid death duties, Picasso's heirs had to give the French Government first pick of his art), the Orangerie at the Tuileries with rooms designed to hold the Monet Waterlillies in the best way possible, and the amazing collection at the Pompidou, including some fantastic Kandinskys.
Do the tourist stuff and really go with it - the bateau mouche on the Seine at night with the buildings all illuminated,stroll behind Notre Dame over the bridge to Ile Saint-Louis and stop for fancy hot chocolate "au ancient regime" before wandering the tiny narrow streets, hike up the steps to Sacre Coeur, even the mad artist's square behind it at the Place De Tetres with a zillion caricaturists trying to entice tourists to get a picture done. It's fun to live in a movie for a couple of days.
I would say go, but only if you can approach it with an open heart and want to be pleased. If you go thinking "this is probably going to be crap," you'll not have any fun.