Usually. It's always pleasant to hear one's work is receiving positive attention. Negative attention needs to be constructive to be useful. Hearing that someone wants something, or more of something often only tells me about that particular reader's tastes, which is a small sampling (hopefully) of the readership; if I'm writing for that particular person, that's fine, but otherwise it's just that one person's preferences. Telling me that one wished for more details in a particular scene, or that a character was intriguing enough to warrant more backstory, is more likely to be useful. Telling me that they should have been wearing white stockings and biting their lower lip is... Okay, I might include that, I like to make people happy, but eventually one ends up with a laundry list of fetish fuel. Pushing one reader's buttons is nice, but compelling a bunch of people to keep reading is better.