Nothing is more painful than a customer who doesn't like your work. You learn tough lessons that way.
If you're a wise maker, you seek out those comments to learn from them.
I have noticed, like you (walking man), that the compliments are dished out all to easily, and rarely a constructive remark made. But, consider the setting. Is bladeforums a school of knifemaking? How many people here are actually qualified to make constructive criticism?
Most folks are users/buyers and if they don't like it, they don't buy it....plain and simple.
That's another one of those "life lessons learned".
By day, I'm an architect. I thrive on constructive criticism. I have to live by it too. I have a responsibility to committees, government officials, clients, general public, etc. to pay attention to what they have to say - no matter how qualified/unqualified they may be.
I would like it if we had an area, say, a sub-forum for real critical analysis in terms of design, use, durability, sharpness, etc.
However, the knife world is a largely self-checking arena. If your stuff is crap, word gets around. If it's nice, word gets around.
I have offered constructive criticism (otherwise known as "analysis and response") to makers who have asked sincerely.
I have also sent my work around and asked people to tear it apart. I learned more in that than any knifemaking books I read. And, yes, I did eat some crow!
The makers who's work I have been open and honest about were usually grateful, albeit begrudgingly.
As you've noticed, most of the time it's a "look what I can do" show in the gallery - but I think that's ok. That's what that forum is there for.
If you want to make some serious comments, head over to ShopTalk and post your grievances there. I have, and have been met with responses that often "realigned" my way of thinking and looking at things.
Perhaps an idea we might have is based on ignorance, rather than experience.
There are some "touted" makers here who's knives I have handled and immediately put down in disgust. Just felt awful! There are others who's designs didn't look that great, but sure felt good in the hand!
So, you might sum up my post by saying - "If you don't have anything helpful to say, don't say anything at all".
Dan