Ran through Priority: Thessia on ME3 Legendary.
Sigh. The fun of doing it with Liara and Javik and the conversations between them. Great. The environment is aesthetically pleasing. The reveals on Asari superiority are nice.
Kai Leng.
Goddamn Kai Leng.
That scripted fight sequence. The fact that he keeps crowing about his abilities even if you are kicking his ass. Then you have the continuation of the ego of the assassin who had previously been stopped by a terminally-ill Drell, then only escapes from getting his ass thoroughly kicked by you due to a gunship using high explosives to take the floor out from under you and he then gloats that "he beat you".
Between the scripting of that fight and that writing, it sucks all the joy and delight out of that mission.