I agree. The first three from reddit work really well for me. I assume it's because of the fixed horizontal movement, and the fact that they are captured at the same moment from different angles. :)

The others are nice (but hectic) animations to me.

Intresting, I have a weak eye so rely less on stereo; these pop as much more 3d then a photo.

The ones they generated weren't taken specifically to be wigglegrams so they don't work as well as intentional ones. The biggest problem is number of photos and the consistency of the direction of movement between each image and the next as well as consistent step sizes. They also tend to work better with horizontal movement compared to vertical probably due to it matching our eye layout but that's a guess.