The itemization is truly awful and unrewarding. There's no loot hunt to speak of because of this. Items are generic garbage and you have to spend tons of time reloading quicksaves at big chests, if you want to get something even remotely useful
even on the highest difficulty the most difficult thing is to wait for the enemy turn to end
I don't understand. You say that you get nothing useful, but the combat is easy. But if the combat is so easy for you, I suppose that you must have something useful... Perhaps you should try a combat against level 10 enemies with level 5 equipment and skills. I'm sure that it is not easy at all.
The story comes in these huge lumps of dialogues
Yes. It's customaty in a CRPG. If you don't want 'huge lumps of dialogues', perhaps you should play an ARPG.
Divinity Original Sin is not a fast playing game. It is slow, but this is the way it should be. It is true that when the number of enemies is high, it becomes tedious, bit this happens only ocassionally. Some people don't like slow games. They have good ARPGs and racing simulators, but D:OS it's not made for them.