As far as watching my friends play: SaGa Frontier. Seriously had fun watching him use all sorts of cool moves in battle.
As far as watching YouTube aka Let's Play: Ace Attorney Investigations 2.
I do plan on watching Ghost Trick Let's Play sometime, because I hate the actual gameplay, but the rest of it is very intriguing. Maybe Earthbound, too, because the gameplay itself is a hassle (as Betrayed noted) but I like the quirkiness of the game.
Congrats to azuarc for winning the Guru challenge!