Hey,
Feedback is a big deal to me, partly because it has the potential to be incredibly helpful. The "I like your story" type of fb is also helpful because it encourages me to keep writing. So fb if you have the time, in any way that's comfortable.
I agree with Robin/LonelyTara and Laragh that it's good for writers to specify what type of feedback they're looking for. I appreciate people who admit they're new and nervous about their fic as well as people who ask for frank criticism, both give me guidance on how to respond. However please don't ask for genuine critique if you're not interested in it.
Also, the FAQ's have good tips about leaving constructive feedback. For me, examples of constructive include:
-Can't tell from the dialogue who is talking.
-You brought up this plot point and now it's disappeared - what's up?
-The sentences are confusing, not sure what is intended. Specifically . . . (examples help!)
-I don't agree that canon Tara would do this because in episode . . . (more examples)
-I love how you capture the humor of little kids talking, it sounds accurate.
-This description is really vivid because it captures key details without drawing a map!
Also, a kind word is also precious, most of us are glad to hear them! Not every fb needs to be a literary critique.
I don't mind constructive criticism; I'm glad to get it, but I don't like flaming:
-You're and idiot and your story sucks!
-You're butchering the english language!
If you're intrigued by a story's potential and want it to improve, think about taking a negative impression and turning it into constructive criticism:
Negative: It's totally confusing
Constructive: I'm intrigued by (examples) in your story but having trouble with it because I'm not clear about these points (examples) If you could resolve (examples) then the fic would be a lot easier for me to read. (But don't lie!)
Of course, you want to invest that kind of time on stories that intrigue you and on writers open to input. You can also suggest a beta or offer to help yourself. I was glad to get beta support from Helena (Mrs. Pineapple) for one of my fics and will look for a beta on my next one. I've also beta'd for three people and offered specific support to a few others.
I love that the KB provides such a supportive forum to read great writers, provide feedback, and benefit from the feedback of others. My writing has improved by getting critique from more gifted people and from being exposed to so much talent - so thanks for all the support!
Ariel
How I Met Your Mother