Not because it's difficult, mind you. I just find it tedious to the extreme. It feels like I'm killing everything twice. I was lucky enough to get the weapon I wanted on my third try. But every time after that, I felt as though I was doing a raid for nothing but randomly-generated loot. Not to mention having to listen to Lolth rant like a B-Movie villain.
Now, Fall of Truth, on the other hand, is so much better. It keeps you on your toes the entire time and requires the entire party to work in concert and communicate in order to win. Not only that, you are guaranteed to get Heroic Commendations, even if you don't get any named loot. It's sad how I can loot six chests in CitW and get NOTHING but randgen.
Mix up the raid a bit. Have Lolth, her legs and her navel only show up at the end, and get rid of the portal keepers.
Make the raid more like An Offering of Blood, with a constant streams of enemies, gates, obstacles and some traps.
Make it so that one chest always drops a Heroic Commendation.