When someone asks for your comments on a work that’s been published, they really only want to hear the praises. So, just say it’s good and keep the rest to yourself.
Incident: Someone asked earnestly for my comments on an article that he published. I took a great deal of effort to try to understand so that I can dish out some constructive feedback. When I did, the person was very defensive and countered every suggestion I proposed. Bottom line, unless it is someone you know very well or your loved ones, just say “hell yea, it’s freaking good!” =D hurhur.
From this, we should also learn to be open to suggestions if we ask for them.