(There's something wrong with this post, so if your comments got deleted I am so sorry!)
Criticism can be a really great thing for our writing. I love getting my manuscript back from my writing group (or my family members when they aren't being too nice) covered in red marks. It reminds me that they care.
I'd feel bad if my story was so awful they didn't bother pointing out that I used "your" when I should have used "you're," or that Chapter 25 felt rushed, or that the third paragraph in Chapter 14 was confusing. Criticism is almost always a good thing.
Except when it isn't that good.
I once got a comment from someone in cyberspace that he/she thought my idea was stupid and that my book was sure to be a "dud". OUCH!!! But, even though that criticism was NOT constructive, it did help me to see some of the weaknesses of my plot and work to compensate for them. It also served as a reminder not to take criticism personally, and never to say such a thing about anyone else's work.
I think I've gotten better and better at taking criticism and incorporating the good and throwing out the stuff I don't totally agree with. With every beta read my manuscript gets better, and I am convinced I never would have made it this far with my writing if I trusted entirely on my own skills.
Do you take criticism well? How have good critiques helped your writing?