A good example that come to mind is the C compiler that shipped with HP-UX right up until the end of the twentieth century, which was so bad as to be mostly unusable.
Yeah, and their broken vi. Solaris has issues, too; that's right. But those UNIX vendors have a tight license policy, and
while they all have roots in good ol' Berkeley, their software is closed source.
RedHat, on the other hand, and more Fedora, build their distributions on open source - to the extent that they exclude
stuff ruled by software patents, like mpeg encoding - for anyone to look at, test, and provide a fix at three o'clock in the morning.
The only commercial aspect of their's is testing, packaging, distribution and commercial support for what they call
"Enterprise" (well, certification of their distros too, for closed source stuff like oracle and SAP). They should, for the sake of their reason to be, get that right - and heed the open source community to get it right. The perl fixes are out there for some time now.