Yeah, I know the sequel hasn't been announced yet but by watching the ending we can expect it, and so, I thought it would be nice if Larian could listen to some fans feedback in order to improve their formula.
Feel free to post here your concerns & suggestions.

Here are my suggestions:

-Better main character appearance & animation:
he's ugly as fuck and run like if he was carrying a stick in his ass. Also, maybe don't make him a silent hero, I know that is a gamepay choice but I don't like that.
In resume, he has 0 charisma, work on that for the sequel.

-Reworked gameplay:
some people may or may not agree, but I didn't enjoyed melee, maybe if including some ability to block attacks/projectiles could be the tip.
Also I think the skills & buffs need to be reworked also, buffs should be permanent when you cast them. Some skills need to be either reworked or removed.

-More ways to pimp your pet:
he's more of a gimmick but it's fun, but wouldn't it be nice if we could get some special loot for it? maybe like necro a Champion or one of these huge floating balls?
Also Necromancy pets could get a boost in the cool looking aspect.

-More side quests & more loot:
I like carrying that epic flame sword with +5 in awesomess & having my full "insert epic name" armor set shining in the middle of a battle.

And... that's pretty much all of my suggestions.
Now I would really like to know what are yours.