I have twice tried to install DevStack/OpenStack/RDO to get a proof of concept replacement for vCenter up and running and have ran into nothing but half broken implementations. There are so many moving parts under the hood that I am afraid OpenStack will never be anything more then "Enterprise Grade" software running behind dozens of engineers in large corporate data centers. I can get almost any other Virtualization technology up and running in a cluster faster then I can get a single DevStack node up and running.