Of course the majority were mundane. The majority of Chapo Guzman's private communications would be mundane too. The contents of the DNC emails suggest nothing about the contents of the RNC emails, though I have no doubt that republicans are equally crooked.
The one-sidedness of the attacks? From whom? If you're referring to recent CIA claims that the RNC was hacked as well, then my answer is that I don't trust the CIA. It may have happened, but you have no real proof about Russian involvement at all. Unlike other posters in this thread and Clinton herself, I am not keen on starting a physical war with Russia over conjecture about a virtual attack.