I know this post is like a year old now, but tablets have a really well suited function in some specific roles.
Like there are some receptionists where the business tries to have a more face-to-face and "friendly" customer front, so the receptionist will stand and tap away on network systems on a tablet at eye-level with the customer rather than sit down, tucked behind both a desk and a screen.
I've also seen tablets in a sort of public use role for things like ordering a meal at a restaurant without having to stand in a queue, where the tablets are connected to the ordering system and the orders just go straight into the system.
In neither of these situations could the business get the same (perceived) benefits by replacing the tablet device with a laptop, a smartphone, or a PDA. It would either be more clumsy or inconvenient for the operator or seem less professional and elegant.
Although it's a very specific one, tablets do indeed have their place for now and aren't "worthless garbage" - that's just a boldly cynical thing to say.