Yeah, Master Duel does mostly light touches on the subjects for most archetypes. For something like World Legacy or Duel Terminal, you can find that stuff written in guides, which are translated on the Yugioh wiki. The OCG stories manga also tries to do what MD does, but it's a full manga with a lot of room to flesh out storylines. Unfortunately, this means that each archetype takes a while to get through, so we're still on the 1st story, Sky Strikers. Branded is a whole mess to follow since I believe the storyline is mostly pieced together via card artwork. I don't think there are any guides or anything that actually outline its current story.