Larian Studios Forums Divinity - Original Sin Divinity - Original Sin - General Planning to play whole Divinity series; advice?

I'm in love with old school RPGs although I'm relatively young.

The first ever RPG I've played was Mass Effect. Then I traced back old releases from Bioware, until I found Baldur's Gate 2 which became one of my all time favourites. Since then, I've been hunting down good old school RPGs and found most of those(Arcanum, Torment, Fallout 2, Vampire Masquerade: Bloodline to name a few. I didn't really like Ultima) immensely more satisfying the modern RPGs such as Skyrim and Mass Effect 3.

I am planning to play some previous titles of Divinity: Original Sin before playing this because I want to wait for all DLCs and patches to complete before playing. I've played Dragon Commander which I loved thanks to its humour and great writing.

There seem to be so many titles. If any of old Divinity series veterans are reading this, would you give me a recommendation as to what games are worth to play? If you could rank titles in order, I would probably prioritize using that list.

My sole focus when picking games is the quality of story and writing. Graphics doesn't matter as long as interface is easy to access. I like to read lots of dialogues/be given many choices in conversation or in quests. For reference,

some of my favourite games are:

Torment - fantastic writing and dialogue
Fallout:NV - so many choices/multiple ways to solve a quest
The Witcher 2 - great story

some of unfavourite games are:
Mass Effect 3 - so many plot holes despite great gameplay
Last Remnant - so much level grinding and too many battles
Fallout 1 - unskippable battle, mediocre writing