From Valve Developer Community

Note: For the sake of this article, r represents the rating score of any arbitrary Steam account.

Note: For the sake of this article, h represents the playing time over the last two weeks of any arbitrary Steam account.

Rating Score Rating Title Playing time (last two weeks) r = 10 EAGLES SCREAM! h ≥ 32.0 9 ≤ r < 10 Still not 10 28.8 ≤ h < 32.0 8 ≤ r < 9 COBRA KAI! 25.6 ≤ h < 28.8 7 ≤ r < 8 Wax on, Wax off 22.4 ≤ h < 25.6 6 ≤ r < 7 Oooh! Shiny! 19.2 ≤ h < 22.4 5 ≤ r < 6 Halfway Cool 16.0 ≤ h < 19.2 4 ≤ r < 5 Master of Nothing 12.8 ≤ h < 16.0 3 ≤ r < 4 Shooting Blanks 9.6 ≤ h < 12.8 2 ≤ r < 3 Nearly Lifeless 6.4 ≤ h < 9.6 1 ≤ r < 2 El Terrible! 3.2 ≤ h < 6.4 0 ≤ r < 1 Teh Suck 0.0 ≤ h < 3.2

The Steam rating was a gameplay stat viewable next to a SteamID profile.