Finished it last night. Liked it very much. Not as much as season one, though. Couple of things that left me a bit dissapointed. Spoilers ahead
Again, Elle saves the day. Through her powers. Again, Will is mostly a victim and needs to he rescued. It would have been cooler to let Will have a greater hand in his own rescue. It would have been more interesting to let Elle discover the limits to her power. To let her find out power alone is not enough. She felt more like a deus ex machina instead of a person, regardless of how the writers delved into what happened to her mother, or what happened to her in Chicago. If Elle had died closing the gate, or lost some vital part of herself, it would have been more satisfying, albeit infinitely more sad. Will helping her out, via his infection caused by the Mindflayer, would also have been a better option. Him, turning the weapons of the enemy against it would also have been more satisfying.
Still, enjoyed it very much, will watch season three.