I couldn't hold out so I reinstalled bg1 and 2 with tutu mod yesterday. It has been a good 4 or 5 years since I've played these.
The biggest problem with inventory is the stack size of 20 arrows. You fill up your entire archer's inventory with arrows and he still runs out half way through a dungeon.
Many aspects of the game kind of need some rebalancing as it is. I've been reading many guides and forum posts about character builds etc...
For instance, mid to late bg2 your characters to-hit bonus outclasses enemy ac, so at this point in the game only damage amount matters. (making a ranger archer build useless, unless you can afford those magical arrows which are always ridiculously over-priced) Otherwise, an archer is just slowly pecking away doing practically nothing. Bg1 to early bg2 an archer is god though as your biggest difficultly is overcoming enemy ac.
Some of the sublcasses seem laughable. (the Wild Mage is laughable in a good way though. lol)
Stats... dnd 2.0 rules are weird. I'm glad it's staying 2.0. (I wouldn't mind a 3.5 conversion though which isn't happening) During character creation and on the character sheet there needs to be some indication on how your stats are effecting your character. Cha doesn't affect turn undead for cleric or paladin at all. Just class level. Int doesn't effect mage spells at all, just the number of spells in your spellbook. As some examples.
I'm quite certain you can give your character a cha of 6 and it wont effect a thing. (maybe purchase costs?) If I remember correctly, a 2.0 sorcerer is using int for spell numbers.
A monk... I have no idea if wisdom does anything for this class. It's pretty darn important for 3.0 + though.
There are just way too many unknowns.
To make a character you are forced to get on the net and spend an hour googling answers. (if you don't want to find out after 300 hours of gameplay that you've gimped your character)
These are still my favorite games of all time, but for the remake, things like this need to be addressed in my opinion.
EDIT: If I remember correctly there is only 1 (ONE) pure playable npc cleric in bg2 and she is evil aligned. I'm guessing this is something they are going to fix since they did say something about adding new playable npcs. Potions are expensive, and healing is hard to come by. To have a good party, I think it's almost necessary to start a passworded multi-player game and make 2 characters (one your own, and one a cleric) and assign them both to your party.
Double Edit: Holy shit. Don't bother with multi player.. it crippled my home network. lol. After launching a server, suddenly wired and wireless computers stopped working. Windows reported the DNS not responding. Don't know enough about it to say more. Had to reboot the router to fix.