This is not a collection of Picasso's best or most famous work. Rather it collects unknown and semi-distinguished pieces all produced during the political upheaval of WWII. As such it tells the story of the occcupation of France through the perceptions of one artist who survived it, and transformed the experience for the world to see through his art.
While it gathers some curiosities, like developmental sketchs for the classic Guernica, the real star of this exhibit are lesser known classics like Night Fishing at Antibes.
Don't buy this for a general introduction to Picasso's art. Think of it as a kind of emotional history in pictures.