Stories from both games were neither good nor bad in my opinion, but anyway I really liked both endings. I liked better the story from Mirror of Fate because it is more tragic and handled with sensibility, and Trevor's ending is to me, so far, the pinnacle of the MS games, together with the castle from Mirror of Fate.
Perhaps the fact of the story being shorter contributed to a better story, so I don't know what to think about 3 hours of cutscenes.
But, about the main topic, I really hope LoS 2 retain the look of MoF's castle, because, in fact, I enjoyed it. It wasn't perfect, as I stated on another thread, but it was very nice to look at, especially some backgrounds.
If they use this approach and take advantage of next gen graphics, visuals of this game could turn out to be outstanding.