It probably is a bit ahead of it's time in terms of the idea. In terms of the execution it is a bit laggin behind the times. Just as Apple are picking up marketshare along comes an app that gives us a home file server and automatic backup, yet it doesn't work with a mac (the filesharing does to a point, but the backup facility not at all).
It's ironic really considering the interface is very mac-like (in that it's pretty straightforward, limited options so as not to confuse). Maybe by the time WHS 2.0 appears then it'll support Mac properly and the teething issues will be gone. All those who shun Vista till SP1 would do well to sidestep this release until version 2/3. It's revolutionary, but not ready for prime-time yet.