“Kill this”, “disarm the bomb!”, “kill that other one”, “everyone wants to kill you, kill them first!”, etc. The way that the story pans out is also cheap “Someone dies -> zillion overkill quests -> put some fluff espionage stuff between the quests –> one choice -> boring and expected “twist” -> final boss -> another choice –> the end”.
It's not "writing", it's quest design. If you don't like it, I feel sorry for you.
"Wake up", "Amnesia", "Find our what's going on", "Kill one boss", "Kill another boss", "Kill yourself - oops, you can't", "Go to the last boss", "Choose one of the endings". There you have it - Planescape: Torment has shitty writing! Who would have guessed!