I've often noticed a tendency here, especially from non-moderating members but maybe also from mods, to brush off criticism with the sort of "if you don't like it, leave" mentality, maybe also accompanied by an emotional appeal to how much resources it takes to maintain this board.
I find that curious and something that I have not encountered on another board I'm a member of. I think it's a given that people will criticize, and I don't think the problem can ever be that they criticize (instead of showing gratitude or whatever) but rather whether their criticism is plausible.
(I cannot help but note the analogy of the way in which people reject to criticism of the US government: "move to France, then".)
"and I stand
upon a mountain
made of weak and useless men"