What can I use Apple TV for in an Android household
If you have a cable TV subscription, you can watch quite a lot of TV content through the different networks' apps.  If you own a lot of your own content, sitting on your network, install Plex Media Server on your PC/Linux/whatever, and the Plex app on the ATV.

I'd mention that you can play games on the ATV too, but I haven't found any worth the time yet...