T2 even tells you your in for a hard time on level 2. Adon says "The River of Souls..." with disdain and disgust .. 
The level itself can be a hard time, if you play in number order and without getting the good stuff from the Death Marshes, first.
EDIT: Including Breathe of Life to farm from this location:
(I'm giving Hardcore mode a try, but I still have Hive of The Mantids to do on my Normal play)On my run of this level on the remaster, the Oblivion portal didn't seem to respawn ammo. I did get the early Grenade Launcher in that palace area (also the multiplayer map area)... The water was instant death after the first skip, but it was worth it! xD
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Speaking of adding more... I hope the multiplayer gets a Mantid Hive and Primagen's Lightship map, soon. Those would look good and I was watching some of Vis' videos, last night (Hive of The Mantids map).
PS: I love the Death Marshes map and the Lair of The Blind Ones is cool, too.