Well, ReactOS has the same problem as Linux (MacOS, BeOS, ...). They're all well-meant and great, certainly much better than Windows, and such... but they have one problem, they just don't work as desktop systems. Mostly, that's because third parties don't properly support them (drivers), or because just the one program you want doesn't run (and then it does not matter if 213 other programs work fine).
I plug my standard nVidia graphics card into my standard Windows PC and it just works. I attach a second standard monitor and click on "expand desktop", and it just works. I want to play "Lord of the Rings Online", and it just works. I plug in my SpaceNavigator, it tells me "click OK to install driver", and it just works...
Under all those "better" operating systems, my experience is that things either don't work at all, or they take 4 hours to set up and then only work half way (like, software rendering with a Geforce 8600 plugged in).
This doesn't necessarily mean that those operating systems are bad, they aren't... but they just don't work as dektop systems if the most basic things are amiss.