Current Mandriva installer ( based on livecd ) is far from being suitable for a server ( no automated installation among others, nor network one ). Lack of resources to do security updates ( or updates alone in cooker ) would be another one. For example, there is lots of old packages according to report like http://youri.zarb.org/demo/mandriva/updates.html
Puppet is outdated ( and with several CVE ), mantis is outdated ( several CVE too ), tomcat is suffering from CVE-2011-3375, sympa is suffering at least from CVE-2012-2352, etc. And that's issue in the current development version, so unless someone fix them, this will end in the next stable release.
Most server packages maintainers, if not all except those paid to work on Mandriva, are now working on Mageia, and a independent body is the best way to share the work and the burden of maintaining a distribution ( and that's why Mandriva finally moved to follow the step of Mageia by having a separate entity for the community, split from the company, because otherwise, people are not really eager to work for free if they (wrongly) feel they cannot decide anything ).