At least ReactOS isn't likely to incite a religious flamewar: LosethOS, the creator of TempleOS, pushes his religion on you. Ignore him: don't feed the trolls.
I _like_ it that operating system news is posted on HN. Operating systems take _forever_ to get anywhere, unless you're a multi-billion-dollar company with armies of grunts working on it.
Their goals actually are not that outdated: a non-trivial number of Fortune 500 companies continue to need Windows XP, but Microsoft is giving them the finger. Whether ReactOS can step up and fill in that need or not, wouldn't an entrepreneur want to know that this is possible?