I concur with Chessrock and JuSumPilgrim. I have one and I like it on my voice, also on acoustic guitar. I've used it on acoustic upright piano because at the time it was the only mic I had (SM58s don't count for that). For that, I could get a good sound if I really worked it, but that wasn't an ideal situation.
For male vocals, I tried the NT2 once on one of the singers in the band I'm in. He's got a raspy, airy sound and is definitely in tenor range. At first I didn't like what the mic did to the rasps ... but when I did a 1 dB cut at about ... 1.2K, I think ... it sounded smooth and quite good. After I got that artifact out, whatever it was, I was able to hear what the mic was doing to the rest of that voice signal, and I really liked it.