You won't benefit from anonymous criticism
I recently heard from a TED speaker who was able to quote, verbatim, truly nasty comments people had posted about her talk.
And yet, I've never once met an author who said, "Well, my writing wasn't resonating, but then I read all the 1 star reviews on Amazon, took their criticism to heart and now I'm doing great..."
There are plenty of ways to get useful and constructive feedback. It starts with looking someone in the eye, with having a direct one on one conversation or email correspondence with a customer who cares. Forms, surveys, mass emails, tweets--none of this is going to do anything but depress you, confuse you (hey, half the audience wants one thing, the other half wants the opposite!) or paralyze you.
I'm arguing that it's a positive habit to deliberately insulate yourself from this feedback. Don't ask for it and don't look for it.
Yes, change what you make to enhance delight. No, don't punish yourself by listening to the mob.