This, for me. Most importantly, you should be able to pick between several options for dialogue to fit your character. This is an aspect of role playing that has always been absent from TES games. Skill related dialogue would be nice, too. The Oblivion mod "Integration: The Stranded Light" included a lot of skill related dialogue, and it worked wonderfully.
Am I the only one
against this? TES games isn't about a streamlined overall experience with a particularly important dialogue system with character-related choices and all (even Mass Effect kind of fails at this). I mean, implementing this bounds to
significantly give less dialogues period. Just look what complete voice acting did, the difference between Morrowind and Oblivion is tremendous, and what are the advantages to the actual system? None. I don't want Skyrim to be a huge world but empty of quests and things to say to NPCs. 80% of Oblivion's NPCs had NOTHING to tell me. In Morrowind, for a quest, I could ask plenty of people about a specific thing, maybe get redirected to someone. Voice acting made this impossible, you'd have to record the answers with all the races different voice actors, and even then we wouldn't get much difference between the lines.
Character related choices in dialogues are incompatible with sandbox RPGs like TES games, it would inevitable restrict content in a type of game whose content shouldn't be restricted. Oblivion didn't have that much quests for a character who didn't want to do everything and actually roleplay for real, I don't want to feel like missing out if my Barbarian isn't making potions or retrieving flowers or mushrooms in a garden. A quest isn't hard to write lines for and modify them, but when you need to get everything voiced, you get restraints because of the budged. And then you add plenty of choices for plenty of quests? More time is taken writing those outcomes not only as additional dialogue lines which must be voiced (thus more expensive), but has to be programmed. It would just be restricting content, I'll play KOTOR, a much smaller RPG scale wise if I wanted to have real conversation choices.
Even more goes to everyone who wants to hear your character talk, go play Mass Effect, a game which is much, much smaller in scope.