Yeah...
I absolutely LOVED this game but the 3rd act was seriously hobbled and gimped.
The final battle was an absolute dumpster fire(at least for a multiplayer party).
The blinking/blackscreen transitions when going from one character inside the Elder Brain portal was infuriating to the point of everyone almost rage quitting. The Emperor petulantly deciding against every instinct he has been shown to have to have, suddenly agreeing to side with the Elder Brain against you when you choose to spare the Leader of a fricken people who can bring their entire race out of slavish fealty to a Lich Queen?! What the Hell? How the final battle utterly pales in comparison to the Ketheric Battle in Act 2! Hell, even pales to almost every other big battle available to the player in act 3!
It is REALLY obvious how super rushed Act 3 is. I hate to say it but it really throws a pall over the entire rest of the game it's so badly done as it is now. I REALLY hope there is a big patch addressing some of these things.