Vendrick was surprisingly easy, but man there was something seriously pitiful about seeing him down there gone completely hollow. 2 still doesn't have the atmosphere that 1 has though, but this helped. Feels as though the NPCs in this game are a lot less glum except the crestfallen meek guy. Whereas in the first you had Artorias/Sif, Solaire, Siegfried etc who had tragic storylines and every NPC you meet in general is doomed and you know that from the second you meet them. In this they are just questing for power etc, you never run into any of them who have gone hollow. :/
Although I suppose Lordran and Draigleic are completely different areas, and Lordran was deeply corrupted by the Abyss so it's no surprise everybody who went there was destined for misery..