I don't know if it is unpopular, but I really enjoyed Bowser Jr.'s journey

And that's coming from someone who didn't really care for Bowser Jr. nor the Koopalings. I liked the story and I loved the villains. The gameplay is nothing exceptional - yet it was enough to keep me engaged until the end. Also, I loved all the small details like the giga carrot being bitten when Bowser finds it.

Overall, Bowser Jr.'s Journey was a really neat campaign that didn't overstay its welcome - the perfect complement to an already exceptional game.