I remember a lot of people saying last year that when you look at the tablet, it looks like a awkward monstrosity, but it fits perfectly and is comfortable in your hands.
I actually think it looks and will feel great, especially compared to where the pro controller is right now. Looks too compact and awkward right now.
However, the fact that it is a controller similar to an Xbox means that Nintendo is getting pretty serious about the whole third-party deal. I think Nintendo COULD make the move into more "hardcore" games.