Well the damage is known if you played 1.0, for one the destructive force was so devastating to Coerthas that it changed a once green land, to one of a colder/winter climate. The connected points to Gridania and Coerthas show off a very ravaged piece of territory that is pretty much on the border of their homeland. The enemy forces made their camp in the uldah area that was ravaged by the calamity, the connecting areas between ulda/mor dhona are very much lacking life, very dead dark zone.
So the sights of the destructive force are there, for the rest of the areas, they repaired, rebuilt, if I'm not mistaken it has been 5yrs since the calamity and honestly in 5yrs time it's easy to recover.
Think of natural disasters that have occurred irl, and how much time it took them to recover. A lot can be repaired in 5yrs time.