I love your voice. You need more voice. We're seeking a strong voice.
I don't know how many times I've seen strong voice listed among the desirable traits on an agent's wish list, or comments on those critiquing blogs about lacking a distinctive voice. Meanwhile, the comments from various writers climb: What exactly is voice?
To put it simply, voice is the personality in the writing. It's about understanding how to get your personality, or that of your characters, to shine through on the page. Everything else is meaningless.
Here's the thing about voice: it's something that develops over time as you become more confident with writing. Basically, there really is only one way to develop a strong voice: write, edit, write, edit, write, edit, lather, rinse and repeat.