Well you could restore all the default directories and such with permissions but some vital files would be missing, especially the packages info stored in the directory. If you use pkgtools like removepkg, installpkg, etc, all those are wiped so you couldn't use those tools to perform upgrades, installs of tgz packages, etc.
But one system is different from another. You could have had directories others don't have and vice versa. I'd suggest if you don't have too much on this machine, back up all your other configs/files and just do a reinstall of your system if you don't have a backup copy of your /var directory.