the only thing I seriously dislike about SDA is Serana's comments about heavy/light armour.
Marty has very clearly never seen videos of people actually moving around in plate armour because he wrote Serana's dialogue with the implication that it's immobilising to the wearer.
I'd call it character writing, but:
1. the attitudes written into the dialogue reflect a modern real-life misunderstanding of the subject
2. Serana was at one point in her life nobility, she would have seen how mobile people are in heavy armour at least once.