It does seem awesome to be fair, but from what I've seen, you could effectively do the same thing with a normal desktop pc, controller and a HDMI cable anyway. The only thing going for it is Steam OS, but that just takes away the other things you could do with your pc.
I loved Tropico 3, but for some reason never got around to playing 4 or 5. If you like city building games, there's no reason you won't like it. It's pretty much Sim City on a small island where you get to be a dictator and shit.
Woulda bought Borderlands if it were a fiver. But it's not all out yet and by the time it is I'd guess it'll cost around a fiver anyway. So meh. Hotline Miami 2 is another game I want but again, not paying that much for it. I'm a right stingy bastard me.