One of my friends, the only one I know with an Android tablet, bought one and never seems to use it, but I don't know what happened. I know another friend who bought a Sony tablet and only used it once, but he doesn't really count since he did that with an Xbox 360 as well (neither game that came with it worked).
Oh I use my tablets far less than what I used to - in fact I sold my retina iPad - but it's not because of what the OP inferred as a usability issue (for either my Nexus OR iPad tablets).
Personally, I think that with a limited screen size the iPhone offers, using iPads seems more genuine because people want a larger screen. I stopped using my tablets because my Note 3 screen size is sufficient for most of what I do, so I don't need to use two devices.
But to just dismiss Android tablets as a collective whole as nothing but trash as the OP did is ignorant.