I guess. I haven't found ANY features on any of these that would compel me to switch from Apple TV. It has a clean interface and streams video reliably from either my iTunes library or whatever channel I pick, and that's 99% of my use right there. On top of that, it will let me AirPlay from my phone or extend my display from my laptop. I can type directly into search fields from a paired bluetooth keyboard or the on-screen keyboard on my phone. I'm not out to play video games on a crappy set-top box (have an Xbox) and voice search just sounds like a gimmick. Seriously, what am I missing by not having a super over-spec'ed Fire TV or whatever?
I think you're missing the point.
Do you like Siri? They call it a gimmick, Apple calls it a major feature. You're doing the same thing but in reverse.
Outside of keeping a keyboard on your couch (just plain ugly to lug out a keyboard when using your TV), you can speak right into the remote (hey-- just like you can speak to Siri

) If you don't have a voice remote, you can use their remote app (already out for Android, soon for iOS), because if you have a keyboard on your lap, I'm sure you have your phone out.
They have all of the channels you have, PLUS games (not everyone wants a horrific looking xbox in their living room, but sometimes kids want to play some games). But hey, might as well add some xbox controllers to your bluetooth keyboard, right?
Plus, you paid 2.5x the cost for your Apple TV (for Prime members right now, the Apple TV is 4.5x the cost), and the remote requires line of site and another product next to your TV. But hey, if you have a bluetooth keyboard, xbox controllers, and an xbox staring at you as you sit on your couch, what's an Apple TV to boot?
So the feature you're really paying for now is extending your desktop on your TV. But guess what? I use my computer... on my computer.
So while there still may not be "ANY features" that interest you on "a super over-spec'ed Fire TV or whatever," hopefully your cluelessness as to the appeal of these products has been reduced somewhat.