Beautiful robust operating system base like solaris, made by Joyent inspired by opensolaris coming from solaris 10 from Sun Microsystems. It has many features first of all for all ZFS. Personally I feel the lack of a reference hardware (as was SPARC) and the possibility of having the desktop development version, even minimal.
Very robust OS and probably the best for container virtualization. Each container zone or KVM VM leaves on its own zfs file system, which can be snapshotted, rolled back, sent/received incrementally to a remote host. Data sets, like htdocs and db, can live on a separate zpool and given to a zone via lofs. You can build your own packages from sources by using pkgsrc environment and keep the applications up-to-date. The drawback is incompatibility with some hardware and leaving support for Linux LX containers.
Best solid configurable container OS. Can run *nix and Windows with ease. Can use Docker but doesn't need it. Use it on a small server or in a billion dollar data center. ZFS for easy redundancy, backups and container management.
Would have been 10/10, but lost one point for not having nano in the global zone :P
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