There is a big difference between false praise and encouragement. We are all (or most of us) are still in the earlier phases of our quilting journey and we value the encouragement we are given.
I think that when someone asks for creative suggestions about their work, then it is okay to give them your ideas. No one can develop without someone who is willing to help them see areas where they need to work.
The value of a piece of art is truly in the eye of the beholder. There are pieces (famous) of art that I think are horrible and would never want in my home while other pay a great deal of money for them. I keep this in mind when I look at the quilts.
With much respect.