From got too big for their own britches. I still feel like they were never meant to be under the spotlight. They had such humble beginnings too. I mean, like, NO ONE used to talk about their games. They strike "gold" with the Souls games and they (and partly due to the publisher) fall into the same trappings a lot of "AAA" developers/publishers find themselves in.
It's a shame too, because after having now played the game, I think the lighting stuff and how it's incorporated with the gameplay is still very much present and interesting. The problem is, as most have suggested, is the fact that they showed/"promised" it to look a certain way and it doesn't. If they demoed the game from the get-go with the current build I would have had no issues/problems with From and this game, but sadly that isn't the case.
Oh well, I've got some good memories of From back from the good old days, when no one gave a shit about their games.