1) Better hair and beard options. Also separate hair options for males and females and no more then 2 variations of 'bald'.
2) Better armor variety for the main protagonist. Also bring back proper plate armor.
3) More interesting, less 'fetch' MMO side quests. Make me actually give a damn about finishing them past just getting them off my quest log. Talk to CD Projekt Red for advice. Also less collectibles.
4) Make interesting characters like Cole, Dorian, and Bull. But also make me feel connecting to my inner circle again. I just didn't get that at all from DA:I unlike the previous two games. Show me the relationship I have with my companions, don't just have them tell me about it.
5) I only played through the Cullen romance, but his personal quest was really good even if his romance was kind of short.
6) More chances for our protagonist to actually have a personality. Bring back the DA2 colored dialogue wheel if you have to.
7) If you're going to give us Dalish elves again for a protagonist option, let them actually know more things about their own people. For a game so elven lore heavy my elven Inquisitor didn't know nearly enough.
8) Make our choices actually matter, unlike this game. I have never had my choices matter less then at the end of this game. Or, just really figure out how to end a game. The ending of both the base DAI game and Trespasser were extremely disappointing.
9) Keep the ability upgrades that came with a recent patch, but put them with the main game.
10) No more 'joke' loot unless you're damn sure your game is perfect first. The flower crowns and cheese shields just came off to me as wastes of time, time that could have been better spent improving so many of the things I was disappointed in.
11) Get better voice actors for the male protagonist. I liked the multiple accents but to me with the English and American male voices both sounded really wooden and shouty.
12) Bring back the DA2 approach to Mages with the huge range of spell types and HEALING MAGIC
13) Bring back the full range of ability slots, don't just restrict us to 8. This was especially annoying to me as a PC player.
14) Show the terrain better on the mini map. I can't tell you how many times I was taken out of the game by anger because I couldn't physically get to where a quest was.
15) A Dalish elf romance with a Dalish elf who loves and is accepted by their people. Or a non Dalish elf who likes the Dalish. Or at least a non Dalish elf who doesn't mock and/or think of them as stupid children. Stop shitting on the Dalish.
16) Bring back the more complex currency system. Having everything be 'gold' doesn't make sense.
17) Better tactics, like the ones you got in DA:O by using the Enhanced Tactics mod
18) Unstick the tac cam from the ground. Basically bring back the DA:O tac cam.
19) If we're going to have a place like Skyhold again, make it actually make sense. Skyhold didn't make any sense as a keep or castle when you really look at the location or layout of it. Also it would have been the perfect place for a final battle with Corephyus storming the gates and our keep upgrades and agents actually playing a role in how difficult the final battle was. That was a very huge missed opportunity.