I listen to Vivaldi a lot, but I think of his music as pleasant background music for the most part. Aside from The Four Seasons and his Gloria, I don't find his music terribly compelling. It certainly is repetitious.
Re: that quote. I remember reading one in a whimsical history of music that stated "some say Vivaldi wrote the same concerto 400 times. That's not true. He wrote the same 2 concertos 200 times".