I never did play pIrates, maybe it's worth a shot on the ipad. (edit: actually just checked all the reviews say it is crashy)
And mobility always beats specs.
Not always. I was at bestbuy playing with the vita and thought this is nifty. Now if only I would ever use one...I just wouldn't. I play video games at home on a big TV. And when I'm out somewhere it's not on my radar to play them.
Tablets will not surpass consoles any time soon. And even if an old console is surpassed by a tablet there will be so many old tablets that nobody will be developing for the brand new one. There aren't any meaningful games that require an ipad3 and won't be any time soon because most people have ipads 1 and 2.
Also, tablets offer a unique, but not better experience to a controller. They are not bad for RTS games, but they suck for button mash games and the faux onscreen joysticks suck as well.