I was actually thinking of this thread recently, b/c I recalled that some thought the Marmottan was utterly skippable. It is - if you are not a fan of Monet, but I still think it's a must-see. In this case, I think it's a situation of knowing what you like and figuring out if it would be worth it to you.

I spent many hours getting to and from a Bosch museum in Holland from Antwerp. Probably only a very few people would think that long of a commute would be worth it. But Bosch is one of my favorite painters and I loved it.

After 4 trips to Paris where I did not get to the Marmottan, last November I finally did. I loved it.

I bought a poster of Impression, Sunrise and it is hanging in my bathroom where it brightens every single morning. I even bought all orange towels in honor of it:)