DA O:
• Simple but compelling story with a clear goal at the end that didn't need manufactured drama or mystery elements to be interesting.
• Everything felt like it had a reason for being there and seemed to have a sense of purpose behind it even when it didn't.
• Companions were simple but engaging, and didn't need melodramatic reveals, angst ridden backstories or artificial drama to feel interesting.
• Story choices that had a direct impact on the final battle.
• Could successfully play a chaotic neutral / neutral / darkside tempted character that didn't feel like a joke or require going OOC at some point during the main quests.
DA 2:
• Average Joe protagonist with normal problems who was interesting and fun without being a mary sue, a chosen one or insert. And didn't need to be made artificially important by the story or other characters to feel relevant and likable.
• Unique story telling style that mostly succeeded at what it tried to do. (Could have fully succeeded with more time)
• Friend/Rival system offered potential for more meaningful and unique PC to companion interaction experiences, better accountability for PC behavior toward their allies and meaningful consequences of actions that didn't include gamey score system elements or juvenile, out of character sequences with the PC confronting or physically assaulting companions.
• Side quests with actual stories, that felt interesting and left you wanting to know what happens next.
• Companions mostly just felt like regular people and easy to identify with for the player and didn't need to be half dragons, all-powerful wizards or beings from alternate realms to feel compelling and relevant.
• Hawke could have a fun, healthy balance of their own personality and the player's personality.
• Villains who felt believable with motives that made sense. Who didn't need to be world destroying monsters, thousand years of darkness clichés or ultimate evil stereotypes in order to feel dangerous and make the player feel invested in defeating them.
• Stories didn't always end with a smile and everything didn't always turn out alright.
DA I:
• Gorgeous visuals.
• Phenomenal soundtrack with music that always fit the situation and never felt out of place.
• Fun gameplay with fluid controls.
• Extremely high quality voice acting.
• Last goodbye, The Darvaarad, Garden of the Dread Wolf and the confrontation with Solas was stupendous and how a climax is supposed to feel.
• Very high quality and interesting banter.
• Higher than average amount of main characters, and everyone had a good amount of screen time.
• Diverse cast of companions.
• Main characters that weren't just a bunch of straight white people.
• Minority representation you'd find in precious few other series. (I think some of this could have been handled better. But the fact they tried to represent groups of people most other games and stories completely ignore deserves credit.)
I've probably forgotten some stuff but this is something. As for DA4.. I don't know, I'll leave that up to anybody reading this what I think DA4 should be. Heh