I agree with to you a large extent.
I played through full EA twice as good and neutral (surface + underdark) and as evil once (surface only). I feel like the game is very inconsistent with what it offers you in terms of branching dialogues and possible outcomes. But there are also plenty of times where the different outcomes are so well hidden that 8/10 roads lead to the same end result.
The current state of the game makes me undecided about this for two reasons.
- The first one is the number of bugs and faulty flags tied to dialogue and quests.
- The second on is the amount of story we have been presented with. We may or may not see future encounters that are very much dependent on the dialogue you chose that, at the moment, didn't seem to affect anything.
My reply is not really what you asked for, but I did change my view of this to a more positive one the more I played the game. Maybe you will have a similar experience, and hopefully new players will not be left with the same impression on full release.