Not the worst but my biggest disappointment : Shadowrun Hong Kong.
Back then, I hadn't played Dragonfall (and still haven't, maybe it's the same) but I had very good memories of Dead Man Switch. It was short and linear, but it was very well handled and narrated.
Hong Kong in comparison made me feel like the writing team had a wordcount to reach. It was full of completely unnecessary and irrelevant lore and characters talking about their background in the most random and chaotic way.
Felt that way about Age of Decadence. After a while, I skipped most of it.
I like how you emphasize the title for extra shock value.
Not that I disagree mind you.