My bad, forgot it was called 3:2 pulldown This is still unnatural though.
I'd still argue that removing the need for 3:2 pulldown would make it smoother.
Motion interpolation would work for, say, 3D animated content. I use SVP on stuff like this and it looks nice. Generally, I would recommend using SVP to make panning shots smoother (certain settings allow that) - I've tried some anime with the characters' moions interpolated and in certain situations it does look very weird - almost overly smooth, as my brain is so used to watching 24Hz content. Or it could just be the interpolation is not complex enough to produce realistic resuls.