Correct me if I'm wrong, but what you're seeing in the comment section of the Guardian is AFTER moderation has taken place – both longterm (blocking trolls) and short term (removing/blocking comments). So obviously it doesn't look as bad as what you're seeing WHILE moderating reddit comments and you can't really compare that.
It's like I'm saying "moderating reddit is easy, I barely see any spammers or trolls there" (as a user).