I suppose that to "hear things right" there are several elements to consider.
1. Born with normal or hopefully better hearing, no real defects or negative deviations from the bell curve to skew your perception.
2. A good room and monitoring system to "present" your ears with the proper sounds.
3. Conditioning, what you've learned over time by listening to music, how different styles and types of music generally sound.
4. Aural memory and imagery, the ability to compare how a mix currently sounds, with an more "ideal" sound, found in your minds' ear.
5. Ability to analyze sonic problems, and how to treat them in a way that is musically friendly to the material.
6. and most simply put, are you in general, a good listener? : - )