@ HYR 2.0
Renegade choices can be useful. in ME2, choosing the Renegade path in ME2 makes Zaeed happy and lets you avoid a high speech check to keep his loyalty. Paragons can finish that quest without his loyalty, even kill him. Renegades also hurt the gunship in Garrus's recruitment mission, takes a killer out of the world in Samara's loyalty mission, etc. The Paragon non-charm option in Tali's loyalty mission has repercussions in ME3. And Renegades have the optimal outcome in the Tuchanka scenario when it comes to War Assets.
The problem with Renegade was that in ME1 and ME2, they attach a sadistic and mean tone when there shouldn't be one as Renegade is a philosophy on how to handle a situation. ME3 eliminates this sadism, as the Renegade Shepard is far more human and less of a sadistic power fantasy one liner. In fact, he is the more confident and realistic Shepard while the Paragon mopes at times.
DAO, outside that one choice on deciding who should be king of Orizimmar is pure black and white. It just has no scale. I am simply not fooled. The easy rule is if Leliana approves, its light side, if Morrigan approves, its dark side. Many choices in DAO are clear good and clear evil, unlike say The Witcher. Paragon and Renegade on the other hand are not good and evil. Many moments the Renegade is also doing a good thing, saving someone, not approving of a despicable action (see Gavin Archer experiment on David) or toughing someone up. Not so much with evil DAO characters.