reddit front page used to be all memes and humour ...now it's all US bizarro world politics and weird interpersonal sexual TMI stuff.
That's got to be Reddit's biggest challenge. The default subreddits are ultra-useless, ultra-high noise. Quality of discussion is on par with YouTube comments (ie abyssmal) A lot of the individual, smaller, focused subreddits are extremely valuable. But, nobody would know it at first glance.
I have a really, really, really hard time believing that the ultra-uselessness of the default subreddits is anything other than a _deliberate_ attempt on the part of the reddit admins to make them that way.
Or, to be more direct - I do not believe at _all_ that the political slant of reddit's main subs is organic.