Bethesda's current flagship single-player RPG's are doing absurdly good at retaining an active player base in recent months on Steam. The data was collected through myself dissecting numbers on steam charts over the course of about 13ish days, at exactly 6:00pm EST and using past data.
In spite of criticisms, it seems as though Fallout 4 and Skyrim are still pulling ahead of some of the newest and top titles on Steam, let's take a look.
Steam Charts: http://steamcharts.com/top (The servers measures player populations in real time)