When someone criticizes a course that happens to be brown, that does not mean they are complaining about it not being green. Emerald green putting surfaces that putt like some of the Chambers Bay greens have putted at certain times during this US Open would be criticized for putting poorly.
For certain influential USGA types as well as many people on this forum, it seems to me if a course has the One True Monoculture of grass and is brown and dry then it is good, period. If dry brown Fescue fairways play well they are good because they play well. If stressed, possibly dying brown greens putt well then they are good because they suit their purpose. Dryness, brownness, Fescueness, stressed conditions...all these are means to an end.
Except to those trying to make some kind of quasi-mystical point of advocacy. Brown Fescue grass isn't part of some higher truth. It's just grass after all.