You really gotta be in the right mindset to enjoy using, so I can see why its doesn't peak your interest.Still, got a new unpopular opinion now...
I never really cared much for FlipNote.
It's just a messaging program where you can draw images, and only has any appeal because it's on the 3DS rather than because it's particularly good in of itself.
To be fair, I never used the animation part of Flipnote much at all though, I used it mostly to watch the stuff people posted on hatena, like a poorman's youtube. (because I wasn't allowed on YT back then)