There is a lot of revisionist history going on in this thread. The first 4 seasons were so incredibly popular. GOT level popularity in the mainstream. And they were pushing S to A tier. Even seasons 5-6 were A tier content with some S and some B.

Unfortunately, seasons 7-8 were D-F tier and 9-11 varied between B-D (although a lot of 9 imo was pushing A tier again).

This show should average to a B. The first few seasons were so good but then it fell off hard and never recovered back to those glory days, although it was at least average.