Warframe had a busy December - might be a good time to revisit
Digital Extremes were quite busy with Warframe in the past week or so. In the last couple of days there was a major update, several content packs went on sale with Steam, and server populations have gone up 10 per cent in the last month.
Warframe clearly isn't the game, that released to mixed reviews, some years back, anymore. The third person co-op shooter is free-to-play, so if you feel like sinking your teeth into something new over the holidays, and missed it at launch, you wont get a better chance.