I personally like to hear that the reader has a problem with a line or a word, or that I have lost them here or there. It tells me that I had them for a bit, and that I need to take another look at that line. I need to listen to what they feel the problem is, and judge the level of sincerity and knowledge of the commentator. If the point is valid I can address it and end up with a better poem. If not, I can disregard at will.
Vacuums produce very few good poets.
I would rather have too much feedback than too little. I enjoy a good revision question. It allows me to concentrate my thoughts on what the poet really wants. It helps us both. I always read the questions and insure that I address them regardless of what else I may want to add or express.