Well, we all have different likes and dislikes but for ME:
I would like, first of all, MORE CHOICES for player races and types. It is always the same basic thing - cleric, fighter, wizard or mage, barbarian, thief and maybe an ork. Okay, so if ya play BG or IWD you get special kits, but still...How about a Minotaur player race (Personal gripe here: With the exception of orks, All other monster races come in a bad light. Why no minotaurs, or centaurs, half dragon, bugbears etc? Did someone get lazy?) or if not a 'Taur, at least SOME variation.
More NPC's and quests where they interact with each other BG2SoA has some of this and it makes the game a little better IMOHO.
Lets make monsters less one dimentional. If you are in your average dungeon, nearly EVERYTHING you meet wants to kill you, the exceptions being those that offer you quests. How about just some wandering beasts that just want to be left alone or will even help with information? It would be much more exciting if you DIDN'T know in advance that you would have to fight when you see something creepy coming at ya.
Player characters with pets or familiars that have some personality. Torment has Mort, TOEE have animal companions and familiars, and I think BG2SoA has familiars, but they are all so cardboard...
A little humor. I don't need to fall outa my chair, but a little humor in dialog would go a long way, again, this HAS been touched on.
The ability to Craft the weapons/armor/potions that YOU want. TOEE has this to a limited extent - Limited being the key word here. I have had a magic sword idea in mind for years and would love to see it implemented...
Romances. Alright, I know I am going to get in trouble for this one but...it adds to the game (and could add more if the love interest NPC to your PC REALLY REALLY REALLY Doesn't want to go in that castle and Reacts to show it.)
Option for more NPC or different types of NPC.
Better sound effects and/or voices. Expantion packs for same.
And last - a story/layout creator that works. Neverwinter Nights not withstanding, and even that one has some major pains. How about something along the lines of BG - Torment - TOEE ect that would allow for custom made castles, dungeons, swamps, etc.
What kind of game would y'all like?
Minotaur