I think the Marvel movies do okay upconverted because some consideration is given during 2D filming to how the upconversion can be facilitated. The trippy 3D in Doctor Strange, though, is one of my favourites as well.

Fake doesn't mean bad.

The "Fake" category should probably divided into subcategories of low-effort "bad" post-conversion and high-effort "good" post-conversions.

Guardians of the Galaxy Vol. 2 stood out (hah) as a good 3D movie to me, and I've seen some of the real 3D ones.