I don't think they are, but back in 2009 when the Caldari won all the systems, there were complaints about CCP being biased against Gallente. Now that it's the Gallente controlling everything in 2013, there are complaints it is CCP being biased against Caldari.
A general issue is each of the four factions being portrayed with any empathetic elements at all. An oppressive religion and slavery for the Amarr, inept tribal administration for the Minmatar, social Darwinism and fascism* for the Caldari, and amoral hedonism for the Fed. Look at the latest news article; apparently Gallente love watching videos of wartime atrocities moreso than anyone else.
So, yeah, CCP are biased against everyone, and probably should show why we want to associate with them at all. The whole 'good guy' thing with Gallente is mostly an assumptive extrapolation from the fact a lot of their introductory text says they're democratic.
*Fascism in the closest near-consensus definition of it, not the "People in power we don't like" definition.