The Writers Guild of America may not be the most reliable Oscar bellwether due to the their annual heap of ineligible screenplays, but when their winners coincide with the perceived frontrunners anyway, it still reassures any doubtful pundits.
The documentary field, for a refreshing change of pace, went to something other than CitizenFour, which wasn't nominated. Instead, it went to Brian Knappenberger's The Internet's Own Boy. I actually caught up with this doc just the other day, and quite liked it. It's often hard to assess how well a non-fiction film is "written", but I tend to think about how well it illuminates or explains its subject matter. That's one arena where Knappenberger's extensive, comprehensive study of free info on the Internet clearly has Laura Poitras' film beat.