Not an actual complaint as that implies something was done poorly. More like a wish.

When you choose that dialogue option, the target's response almost always is something like "Uh... okay. Bye."


Which is only realistic of course, but you never get to accomplish intimidation through silence as you might have expected.

I'm pretty sure the point of being silent is not to intimidate them.

Safia: "Ah, I see. The old Dark Brotherhood 'silent intimidation' treatment. Oh, I know who you are. Don't be so surprised. You ain't the first assassin sent to kill me. Won't be the last. Now let's get this over with."

Nazir: "Ah, going for the mysterious and brooding thing hmm? That may work for your targets, but you'll find I'm not so easily impressed."

Cicero: "Oooh... So silent. So menacing. A true assassin of the old way. Cicero likes you. Oh yes, Cicero likes you, indeed."

Eh, I still wouldn't consider it intimidation just because a select few NPCs think it is, I more of see it as a way to show your victim who their killer is. Plus if someone came up to you and just stared at you silently wouldn't your response be "Uh, ok bye then" because it's sure as hell would be mine.

When you first meet Astrid and remain silent when she talks to you, she does make some good comments.