After reading reviews, seeing the components, and feeling the need for a fast 2-player game, I could not resist picking up Ninja versus Ninja.
My wife Talita agreed to help me try it out, and it is definitely easy to learn and fast to play.
Component-wise, the ninja pieces are awesome. There's absolutely no need for the game to have a separate Shadow Ninja and Ninja Master piece, and that is why they're great. :) The dice are cute, but a little annoying to actually roll.
Gameplay-wise, like I said, it is fast. I won't go over the rules here; they're simple enough.
We played 2 games in a few minutes; even my wife suggested that we add a house rule to play to more than 7 points. At one point, I was robbed of a win by a die roll of 2 (if I had rolled a 3, I could have gotten home and scored my mission), but I don't think the randomness is too intrusive.
Overall, it is a good game, and it's filling the niche I bought it for. I'm sure that it will be a good solution for at least a few weeks, for the 2 people sitting out of VTES games (or between turns in Battlestar Galactica, or whatever), and again it's a game my wife will play which is always a plus :) . And Eli will be able to play when he's maybe 4 or 5.
On a scale of "GR" to "GRRRRR", I give it a solid GRRRR