Yeah I saw the numbers a while back and without context they could seem alarming, but it's unfair to judge the ratings like that. One thing worth mentioning is that they are pretty consistent from episode to episode in each season. HBO like all cable channels' numbers have dropped a lot over the years due to streaming, and every season of Westworld takes two years to arrive. Like others have said, yeah they dropped, but for one they were way above average in the beginning, and they also are still not that far off from channel's biggest hits.