I did a really cool quest about water and farming last night, started out as a simple investigation, and then I uncovered a very interesting situation that had me quite stumped about how to solve it, in the end. It really helped me appreciate the fine crafting of the world, and how it actually makes sense as a world, not a post-apocalyptic theme park set around the DC ruins.
You really see how precious water is, it's not just two guys who are really thirsty posted outside a couple of important locations. You see what people do with it, the effect that its plenty has on communities, the effect that a lack of water has, and what people are willing to do to secure a supply.
This is probably a top 5 of all time game for me, and I think it's the best 3D/full VO RPG I've played. Better RPG than Bloodlines, imagine Bloodlines if you could choose which factions to help and which to screw-over. The Gothic comparisons are also valid, only the factions are better, the writing is better, the dialogue is well written... this is the best RPG we've gotten in a long time, and for me it validates all the faith I have had in Obsidian over the years.