The thing to remember here is that they do not sound “bad”, they just don’t sound like anything. You want your source audio to sound good, not the speakers.
NS-10’s don’t sound “bad”, they just don’t scoop the mids like consumer speakers. Due to their size and proximity, they tend to cause fatigue due to the fact that they are bringing the full brunt of the midrange in your program material to your ears.
All you have to do with a set of studio monitors to make them “fun” is to engage the loudness curve in your iTunes EQ or that of your favorite audio player. Buy your monitors based on their main purpose and you’ll not regret it.