6 and 7 are among the best the series has. I'd only put 3 above them but they're far above 1 and 2. The last episodes in 6 are amazing (also 6-6 is the best episode in the show) and 7 has some of the best tension in the series (hell, the only reason Ironwood is even good is because of that tension. So if he's good so are RWBY+, the Ace Ops, Watts&co, and the Happy Huntresses)
And while 8 is easily the worst season in the series yet it does still have more good than that (the Emerald, Cinder, and Nora stuff).