In my experience NFS is fine as long as the traffic does not need to traverse a WAN link. The problem, as I see it, is that once something is available via NFS

In my experience NFS is fine as long as the traffic does not need to traverse a WAN link. The problem, as I see it, is that once something is available via NFS everyone wants to mount it from everywhere. NFS simply does not deal well with high RTT connections.