What was an absolutely dynamite multiplayer game on XBLA is also less so here -- once again due to the limited view and a much steeper difficulty curve. It's still fun to team up and tackle co-op levels with a pal (or race against them), but the now-endless supply of solo levels holds most of the appeal this time.
As an enjoyable, pick-up-and-play package with a sublimely simple design, N+ succeeds, and it's hard not to recommend for the price. Just be wary of the inevitable eyestrain, and if you're only going to play it at home, make sure you've exhausted the XBLA and PC versions first. It's still the most badass ninja simulator around...just less so.