There is nothing healthier than that for a writer. Criticism keeps us on the ground, looking at our work critically so that we might bring it closer to perfection. In fact, I often shrug off compliments, or I take them very lightly, because I'm worried they'll destroy me - I know that a big ego blocks improvement, and it blinds artists from seeing themselves and the world honestly. It's good to get compliments here and there, though; they might offer some reassurance that you don't completely suck. Still, we must always continue reaching for our better selves.
As I prepare myself to read those edits - which very likely will slash up this novel I've nursed for five years - I will keep these words in mind: "There's no good or bad. There's practice or no practice." -Based on an oracle Chinese saying and adapted by a modern-day American, my husband. (He's the lucky one who gets to talk me through this!)
So I'm getting in the mindset. Tomorrow I will read over my editor's comments, and I will take them in stride, and my writing will get stronger. I will put my novel before my ego. I will remember that writing is and always will be a practice - finishing the novel wasn't the end game for me as a writer, and neither was finding a publisher. It is the role of my profession to continuously improve.