I would disagree. Ns-10s are lousy monitors, and thats what they are supposed to be. They are book shelf or boom box speakers. Studios use these or auratones to check midrange and lowest common denominator. They do have their place but they arent a good set of first monitors.
I have heard of people getting them as their only monitors, but its really hard to learn to mix on these alone. They are DEFINATELY not flat.
+1
Yamaha NS-10 (not the M version) have their place in most recording studios, but not as the primary go to monitors for critical listening and mixing. There are plenty of sub $600 monitors available, read up on them and you can find something acceptable.
