Why would anyone want to play a shooter on a tablet/phone? Even if you connect a real controller, you're gonna look like an idiot playing it while you're out and about or else you... might as well just play it on a computer if you're playing it at home? Otherwise, I guess it might work okay for a tablet but iPhones are so physically small--how many people actually have hands small enough to play with the on-screen controls and still be able to see what they're doing? lol. I don't get it. But Bioshock was great, so I guess if more people have the option to play it, the better...?
I honestly don't get why all these games are being ported to mobile devices. I can't stand playing anything other than a pick-up-and-play game on my phone (i.e. Fruit Ninja, Angry Birds, etc.). Mobile gaming to me is just a time waster, and I couldn't imagine becoming invested in any type of story-driven game or something like a shooter on my phone. Dedicated console/handheld gaming control schemes do not translate well to fully-touchscreen interfaces.