Firstbrook's objection is mostly crap, but not entirely. One of the problems with the Linux community is that it does tend to undervalue aspects of software engineering besides straight-out coding. People who concentrate on writing good code rather than more code, or who test the hell out of their code, or who do a good job of documenting what they've done, get a lot less recognition than the people who crank and crank and crank, even if what the people in the latter group crank is mostly garbage. This "bad culture" is directly related to the bad example set by Linus himself, who has some attitudes that most serious software engineers would regard as eccentric at best (e.g. his well-publicized disdain for debuggers). The net result is a huge number of people who think they're hot stuff because they've learned a few nifty tricks, but who lack any deep background or self-discipline because they've never been rewarded for those things.
Which brings us back to Firstbrook. Many people have suggested that the problem is not with Linux but with the lack of things like change logs, but my point is that they're not unrelated. People who have become steeped in Linux knowledge have also been steeped in Linux tradition, and that's a tradition that devalues some of the things that matter in a mission-critical environment. That puts employers and customers in a bad spot if they rely on Linux systems, with the most technically savvy people often being professionally "immature" and often too arrogant to admit that the customer's modus operandi may be valid even if it's not "the Linux way". Employers and customers get tired of that BS real fast, and may well find themselves longing for the days when the people who knew the most about their OS weren't obnoxious little punks.
What has made Linux a very good OS is the amount of youthful enthusiasm that has gone into its development, but in a way that's also what prevents Linux from being a great OS. The Linux community is inseparable from Linux itself, and the skewed reward system in the Linux community has revealed the dark side of youthful enthusiasm - hubris, lack of discipline, and a large dose of "Not Invented Here" syndrome.