"Sorry to hear people dislike auto-dialog. I like flow of ME3 scenes -- in ME1, hard to write Shepard decisively w/every line a choice. 1/3"
The huge problem with auto-dialogue is that it's used too much in ME3. ME1 had hardly any, and ME2 had very little, but ME3 just went to the other side of the spectrum and decided to make Shepard his own character.
Investigate options and even the other minor stuff all lead to Shepard being different with each playthrough.
Asking somebody important questions and investigating is more important in a roleplaying prespective than people think. It shows that my Shepard is cautious and plans his steps ahead. If I choose to ignore every investigate option; it shows that my Shepard is reckless and hot-headed, but the latter is interwoven with other choices I make...
There is a lot of debate on the topic, but I think its final: dialogue is important, especially for ME which has been very choice heavy when it came to dialogue. I still think ME2 had the best of it.
But it's your game BioWare, I'm just adding my two cents. Shame though, when people accused ME of being a 'glorified shooter' (which it still isn't) I always turned to the dialogue and heavy choice options. That arguement is a little weaker with ME3. Still, despite what a lot of the 'drowned on my sorrows' people say, ME3 does have a lot of choice.