I have been lucky enough to have been working closely with Final Cut Pro X 10.1 for a few months now.
The result of that is a comprehensive 60-page document created in close collaboration with London-based Xsan and shared storage supremos 10dot1. on how to approach using the software in a shared environment
You can download the document go to the Members section of this website:
To cut a long story short, it is now absolutely possible to share work and media on a centralised server using Final Cut Pro X.
The more I have worked and played with this, the simpler it becomes. It is however up to you to design your workflow, to learn and teach your staff properly.
For a simplified version of events check this workflow.