Oh, there have been a bunch of answers, I did not see it.
Well, I confess that I did not like magic in Divinity. Most of the spells were elemental-based spells, where fire melts ice, which becomes water who can be electrified etc ..
That's quite nice, but why magic is now always limited to fire/earth/ice/storm spells?
That's only used to make simple combos based sometimes on what type of ennemy there is but often just spamming the same combos of spells everytime.
Also, in this game magic is similar to the physical disciplines (there is three if I remember, melee/archery/scoundrel). So whether you play a mage or a warrior, the gameplay is pretty much the same. I would talk about "abilities" rather than "spells".
Me and some friends began a party of IWD:EE recently (I play a wild mage). There was one enjoyable fight I remember :
We arrive in a room full of ennemies, I instantly banish a powerful-looking priest in another dimension so that he won't be a bother for some time, then I cast a silence spell on one of their mages to bother him. I am hit by an bunch of arrows so I create several illusions of myself to protect me. Then I invoke some ogres to distract the archers.
After some time, the fight is nearly done, we will be victorious. I want to cast a haste spell to help my injured allies finish the remaining opponents. Wild magic says otherwise, it is a fireball instead. WoOoops.
If there was a trap our thief could not disarm, or a magic item to identify, I could do it. With good planning and rest, you are powerful. But if all your spells are used or useless and a big troll is running in your direction ... you better run fast!
I remember, it was even more interesting in NWN2. You could alter your spells by changing their duration, effect, strenght, or make it able to launch it without voicing.
Now if I compare with the most recent games ... I don't play a mage anymore, even it's my favorite class.
I think the old concept of the fragile, mumbling and ressourceful mage is slowly disappearing, sadly
But like I said, I will play a monk instead I guess in PoE, and maybe spells will be changed in the future.