Croteam experiments with the level design on this one quite a lot, and it usually doesn't pay off. I played the first 2 levels on Normal and that difficulty is still too hard for me, yet Easy is too easy (which is an issue with the other games in this series that I've played). The approach taken by this DLC seems to be placing more of a focus on fewer hordes of enemies and more heavy enemies that fire at you from a distance, encouraging the use of the sniper rifle much more. The fact of the matter is that staying at range and chipping away at enemies isn't nearly as fun as trying to back away from a swarm and cleaning them up with a big arsenal of weapons.