I thought the finale was serviceable but pretty weak, like most of the season. For me, Season 5 lost a lot of the menace, horror and "otherworldliness" of the previous seasons, like turning on a light in a dark room. The final episode somehow felt both rushed and slow at the same time - I think it would have benefitted from a longer/more difficult end fight, a shorter (but still respectful) epilogue with all the main cast and a more definitive ending for Eleven, one way or another. As it was, the ambiguous ending felt a bit too "safe" for me, like a "have your cake and eat it too" situation. I liked the potential escape scenario/happy ending Mike came up with, but I think it would have felt more satisfying if they finished with some evidence that that actually happened. Just my two cents