It's a MOBA (Multiplayer Online Battle Arena)
Similar to the very popular League of Legends and DOTA2
Sadly due to rebellions decision to self publish, sales and general knowledge of the game have been terrible.
and releasing between AW: Havoc, Dying Light and shortly before Battlefield Hardline is'nt the best way to stand out in the crowd.
The ratings where discovered two days ago (as mentioned in the article)
But this article about the official announcement was posted 6 hours before the official announcement.