I just played canabalt on my OUYA devkit (I'm making a game for the OUYA), and I didn't experience any latency from the controller. A bunch of people played it last night when I demoed the OUYA at gamecity in Nottingham and no one complained about it then either. I haven't played canabalt on iOS and I'm not a big console player, so maybe I'm just not attuned to it