I believe I heard they made an adjustment around how the AI choses which PC's to target, but I think it still needs work.
I was at the Spectator/Drow encounter and playing with a Ranger, Lazeal, Gale, and Asterion. Knowing that Gale would get beat up, I left him at the bottom of the climbable wall and placed the other three in good positions where the Spectator would emerge. When I triggered the Spectator, it released one of the Drow, as it does. Then the Spectator and the Drow proceeded to direct EVERY attack on Gale, at the bottom of the cliff. It flew over Lazeal's head, and right past the Ranger (no opportunity attacks either) and went right for Gale.
Next round, again, every attack was aimed at Gale. The only good news was that it left the other characters free to beat the snot out of the Spectator and take him out easier.
It's hard to use characters to tank, and to protect squishier characters in the back, when all the enemies automatically target them.