Deadlock is absolutely not a Team Fortress spiritual successor, it has much much more in common with Dota 2 than TF2, and is really full of interesting features and polish for where it's at in its development.
Still no remote/bluetooth capabilities. That's the only thing that would make me upgrade, the third-party remotes you can buy are all pretty clunky (bulky clip on the side of the Kindle, need to be recharged often, can only flip forward as they just fake a swipe on the right of the screen).