So far most of the reactions to the 2014 candidatures concern user activity here at Meta. Why so? How relevant can it be to the requirements of a moderator?
Meta is the core of the site, plain and simple.
Meta is where site policy is shaped, important matters are brought up, actions are discussed and community consensus is written. Moderators, by necessity, need to be aware and involved in all of these things.
Moderators execute the will of the community and follow the procedure the community decides upon. Moderators give valuable, experienced input on discussions where policy is shaped. This makes meta incredibly important for site moderation - by moderators and the community alike.
My personal opinion is even that meta should take a more important role in moderation-interested users than it has right now.
Meta is where all the policies of the site, user grievances, and concerns are brought up and discussed. If you have a low meta participation people will make the assumption that you don't actively already participate in the molding of the site as it is today. It's merely a metric used to gauge a persons involvement within the Ask Ubuntu community.
Because meta is the place where you can show you understand, debate about and question the current policies. So when it comes to showing you, as an applicant, are on par with the current moderators meta is fairly important.
Though some do tend to put a lot of emphasis on meta.