To me act 3 feels unfinished and rushed and buggy. I loved act 1 and 2, enjoyed it thoroughly with the exception of the disgusting squid, but at least he wasn't shoved on me that much in earlier acts. His story/character I can do without completely.
Although I did enjoy the exploration of the city on my first run, it becomes more of a chore after that.
The game is bugged for me and even with a LOT of metagaming some quests don't play nicely.
I don't even want to start on the companions cutscenes, no matter what I do and how much I rest, some of them just never trigger for me.
Surprisingly I don't have any performance problems, no crushes, no freezes, no drastic fps drops.
There is NO real choice to be made besides who becomes a squid or who blows up the brain. The only thing I'm happy about is that I can finally slice the Emperor (that slimy squid has been forced into my throat through the whole game). IMHO the ending as a whole is a slap in the face. If I chose to dominate the brain then why can't I be selective as to not to enslave my companions? I'm forced to destroy it or enslave my beloved? The epilogue is even worse, you get 2-3 lines from your romance (in my case Astarion) if you're lucky for the after battle scene to trigger.
Surprisingly companions have very little to say in act 3 with all the life changing decisions going on. They were very opinionated in act 1.
I'm to the point that I just stop playing before the end battle, there is no enticement for me to proceed knowing the end result.
We'll see what patch 3 brings, fingers crossed.