Not quite sure where you are coming from on the 'post every part they stick on' bit. I post loads of pictures with a load of waffle about what I am doing but this isn't meant to be anything other than giving people an idea of how a kit goes together. Sometimes I am a bit disappointed when I see a great build of a kit I would like to have a go at but there is not much info about how it was put together. I for one would be just as happy reducing the number of posts if people don't want to see them, it would give me more time to build them lol

There is a 'Critique Corner' forum for people who want serious critique of their build. Posting in there does not mean that the model will get real constructive criticism as not everyone may feel that they are skilled enough to write such a thing. However, it does mean that anyone posting in that forum has to take the rough with the smooth. I seem to remember there was a similar discussion going on when this Critique Corner forum was originally set up.
The whole idea of a critique depends on quite a few things which can inhibit the quality of the critique. A badly written critique can come over as harsh and possibly cause offence. A good critique can only really be written by someone who has a good background in either the techniques used, the type represented by the model or is well read on the history of the period.
I could not write a good critique as I know little about anything. I wouldn't know if the colour was wrong, the air filters are the wrong period for the type of vehicle or what machine guns were used after 1944. Why don't I know this? Its simple, I don't really care. Sorry if that offends people but I only build models for the fun of modelling not for the research and history of it. That does not mean that I don't respect those that do know, in fact I really admire the knowledge that some people have, it amazes me how they can hold that sort of information.
It also doesn't mean that if someone with that knowledge politely pointed out I was doing something wrong that I would object to having it pointed out. That comes with the proviso that they are not offended if I thank them for their input then ignore it. It is my model and I will build it how I want to which may or may not include corrections to improve it if I feel like doing that.
I could write a critique based on whether I like what someone has done with a build and, if I do like what I see, I can honestly say that for me, it is a great build. This will not be based on accuracy as I probably wouldn't know. It will not be based on the technical ability of the modeller simply because it is unlikely that I would know what their skill level is so would not be in a position to judge it.
Given the above, there would be no inherent value to any critique I wrote but if I honestly like something and get the feeling that the modeller has had a good go at it then I will say so. If I don't like something but do not feel qualified to say why, what would be the point of me saying anything? The downside to saying that is that now, if I say nothing, people will assume I don't like it which may not be true, it could be I just missed it.
At the end of the day, apart from certain aspects of a build, it is all a matter of opinion. Yes, it is easier to say "Great job" than to say "what the hell is that". I don't believe that many people on here take every 'happy' comment seriously but if it encourages them to keep modelling then job done as far as I am concerned.
I certainly don't take every good comment as being gospel, I do know my own abilities and I know when I get it wrong. I, and very few others, build a perfect kit each time. I have never built a perfect kit but if I enjoyed them then I just smile at my mistakes and make a mental note to try not to do that again, but chances are I will. It is a much nicer environment when people maybe are a little overgenerous. Trouble is, now I have said that, nobody will believe me when I say "Great job" anymore.
There is, to me, more to being on a forum than the finesse of the modelling. Modelling for a lot of people is a very solitary hobby. Not all of us have access to, time for or ability to become part of their local modelling club. A forum can be the only social contact many of us have with other like minded people. I will be quite honest in that issues I have had in the past has made it very difficult if not impossible to take criticism at times when I have been on edge. In fact, I will be completely honest and say that I actually offended and upset a well respected member of this forum for saying something to try and help me along when I was in a state were I couldn't accept it. A shameful action on my part which I have regretted ever since. Thankfully that person has been the bigger man and has not held it against me.
So, it is not all about the level of modelling, for some it is much more than that, it is a social club. That does not mean that others are here for more than that, that they need to have real criticism to help them develop their skills. However, don't you think that people can learn and develop by example as much as direct constructive criticism? A ineffective critique can actually be a really negative thing whereas a over generous comment can just give the incentive to keep climbing that ladder.
I feel that there is a place for well written critiques and I am sure if people want them then there are people on this forum who are knowledgeable and skilled enough to write them but, sadly, I am not one of them.