Ehhhhh. One of the many problems I have with Oblivion's (Not how dialogue was handled per se, but how the NPC's interacted) was that it often times felt stilted and unnatural. Its one of the biggest things that bugged me about the game and one of the reasons I never went back to it, unlike Skyrim or Morrowind. Everything about it was just so...ew. I honestly think Fallout 3 handled it better then that, and it was sorta kinda bare-bones as well. Even if Skyrim its the same lines of dialogue (Honestly, I honestly don't think Oblivion was much better at this anyway), at least it doesn't render every NPC as a laughing stock.
Yup. Kills the sense of exploration when you can dart towards every unmarked location you find on you're compass, which inevitably leads you to more unmarked locations nine times out of ten. As for the rest of your points, I'm in total agreement there.
I've been thinking of something akin to a perception skill that would let you "know" and hear where an enemy might be lurking...but ehhhhhhhhh. Detect Life spells and the like sorta make that obsolete, and I don't know if it'd really work well to be honest. Closest non-magical equivalent I can think of is something like marking a enemy in Payday 2 which let's you keep tabs on his position for a certain time, but that's kinda wonky for this series. I would like to see some form of perception, but that screams a bit too much of Fallout, even if it could have a fairly wide range of utility.