Rode has built it's reputation on building quality mics, targeted to a given price range and end-use.
I can only say that I consider the NT3 an absolutely stand-out performer, especially as I focus on recording (predominantly female) vocals and occasionally acoustic guitar in my home studio and I wanted a quality pencil condenser mic which could also be easily portable and mobile.
This mic is very quiet, very clear, yet smooth across the spectrum with very good sensitivity and certainly manages to produce a close female vocal with both air and body. I also have an AKG C214 which is fantastic and probably worth 2 to 3 times the price and I can honestly say I rate the NT3 almost as highly. Remember, it is a 3/4" (not 1/2") capsule which I judge definitely makes a difference.
If I was starting out again and could only have one mic for sensible money, this would be it for all round quality and features, including portability and battery power. And if I couldn't afford the NT3, I'd buy the Rode M3, which I have also used and my son owns and uses on everything!