No mercy is much better with the changes in the end, no more closets.. but can pose a problem to those who lag behind and get clipped on the last rooftop (point of no return)... no rescue closets. NO MERCY is pretty fun on the end with the new infected.. Spitter can make some good changes... Charger is wasted (but i have seen rooftop death charges rarely), jocky is incredibly awsome with the drops to the lower roofs getting group members split.
Some geometry has been changed, no hall stairway to defend both ends, no closets ANYWHERE on roof. The corner jump spot is also not to hot with a good spitter (campaign it still works well).
The Sacrafice is pretty sad really, Some good work with mulitpule paths at all times, splits greedy players up quite well. The Tank in a Boxcar is a hectic spot if people dont kill the tank quick. I personally hate the gravel hill.. One bad player ALWAYS sets it off before anybody else is there.. but if you have good players, its cake.. way to easy for a new Hazard.
I do love the more hazmat suits are in levels.. you can almost do a neverending horde, get those kill counts up (to bad kills count for nothing). Some melee weapons, non stop bile jars... the zombie killing could last forever.