In terms of the view from the museum and the decor of a museum, this is number 1 for me. When you get to the building, which involves either stairs or as you can see an outside escalator, there is the most beautiful view of the whole of Barcelona. The building as you can see is triumphant, and what I love most about it, is the fact that from the outside it is rather old fashioned and when entering, as you can see in the photos, it is very modern and new with small dashes of the old fashioned style being drafted in at points.
The museum itself has a wide variety of exhibitions to look at, pretty much ranging from painting to photography. So there is a bit for everyone, but one should go there purely on the view and just to see the museum's modernity.