On one hand, I agree, we feel bland, on the other hand it's "by design".
Some time ago I watched a video about Commander Shepard and Mass Effect, and how it was actually a huge step forward to have a main character that talks.
The "problem" that rises from that is that you are no longer roleplaying YOUR character, you are playing someone else's character. No matter how much work you put into the character it's never going to be a 1 to 1 of how you interpret your character.
Even if they read the sentence you pick, they might read it differently.
What I somethimes feel though, especially noticable in multi player:
You don't get a feeling your character is interacting. you just pick a choice and see a reaction. In the multiplayer coversations you actually don't pick up on what everyone else is "saying" just get a "okay we are in agreement" at the end.
Not sure how to make it feel more like you are talking, without talking, though.
