If a friend or an acquaintance asks you for an opinion on something they did, will you lie to avoid hurting their feelings?

I have a problem with the idea of getting positive feedback I can trust. Basically, if someone compliments me out of the blue, I believe it. But if I ask them what they think about something, I assume that most of the time they will take the easy way out and praise it, whether they think it deserves praise or not. I think that most people don’t want to hurt others’ feelings. Too high a social and time cost if they do tell the negative truth.

I asked a similar question once before, and as I recall, a lot of people said they tell the truth if someone asks for an evaluation.

So, do you lie in order to save someone’s feelings, or are you always brutally honest when asked for your opinion?