It kinda depends on how you interpret the expression. I think the prequels had a lot of ground to cover, and there's a good story buried in there, but too many pieces are missing, and it all feels "off". So in that sense, the whole is somehow greater than the sum of the parts. It doesn't add up properly, but it tells the story anyway. The sequels are the opposite. Again, some pretty cool parts, but the story they tell across three movies isn't great. It should have been better, given what they had to work with. The grand conclusion of a nine-part epic should have been mind-blowing; instead most people are like "well, that happened."