The problem with getting your news from Reddit isn't just the democratic process, if I remember rightly the moderators of the default news subreddits outright spread partisan misinformation using them.

One could argue that viewers count-driven news are just as democratic, except that people vote by viewing/opening/sharing links instead of clicking an upvote button.

Same goes for the echo chamber comment: Most newspapers are not bipartisan either. Reading Reddit is like reading a single source, in a way.