It's really more instructive to listen to criticisms from anyone.
We tend to look at the course from a lot of different perspectives so who is to say whose is valid. GCA's tend to think in terms of features, and classic strategy, good players in terms of their shots, and other players, well, in terms of their struggles.
One GCA told me he dismissed any criticisms until he found out how a player played relative to his game, because you don't get good reviews from a poor game in most cases. (If you do, then you know its a good course) I always filter reviews by adding the statement "It doesn't fit my game" to the end of any critique, to see if it changes my perspective (remember as kids, adding the words "in between the sheets" to any song title, and the song title still worked?" As in, "She loves you, in between the sheets", "All shook up in between the sheets" and so on?) Same principal -I don't like that tree that prevents a low running hook - it doesn't fit my game......
The other side is, while most critiques are useless for reasons Tom D notes, you never know where a gem will come from - especially when coming from seniors or women who, despite our best efforts, we really can't envision their games, and it is our job to make it acceptable for every one who chooses to play the game, no? One senior told me that I should have more short bunkers because he deserved to get in them too! A few women have enlightened me that my forward tee placements were always made easier, and it was too condescending.
So any comment can be a learning tool, not just those from the gca intelligentsia! In most cases, its something you file away for the next job, as few courses go through annual change like Augusta to correct minor percieved flaws in pursuit of perfection. Most courses wish they could have opened four months earlier for revenue, and hate the thought of closing in whole or in part to make corrections the gca should have gotten right the first time!