Nakama 2 is certainly useful, if you are taking a class and have access to other language sources. For myself, however--and perhaps this is due to my Genki background--it seemed overly verbose, far to big, and not too terribly concise. I admit that my feeling might be quite different if I had worked from Nakama 1, but as it was, when I got to Nakama 2, I knew most of the grammar in the first two chapters and all the vocabulary. Sadly, there was vocabulary from the first volume I did NOT know--which made staying on track in class rather diffficult at first.
My opinion is that Nakama 2 is good and fine and suitable for class guided study. Make sure to get yourself up-to-date on the vocab and grammar if you don't have a Nakama background, though. And if you are looking for self-guided study, try Genki, instead.
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