Energy drain sucks. The quest our group is on has the players exploring an ancient tomb, based on I3 Pharaoh. Long ago the inhabitants sealed themselves in bad stuff happened and most of them ended up undead; ghasts, ghouls, wrights, and wraiths it's a pretty miserable deadly place. We could have easily lost a few PC's if I hadn't gifted them a sweet healing stick to get them through the quest, they might be a little under powered for. Anyway the party added a cleric last session, and as a result they've been doing okay, but a wraith got through yesterday and tagged the ranger.
I've always been of the opinion that energy drain attacks, not only suck, but are kind of unfair. It's happened to me and I hated it, I hated doing it to the ranger, but I'm not happy with any of the alternative energy drain systems I've perused. I've toyed with the idea of allowing a constitution saving throw, but I didn't think of it last night. Oh well, dame you Tolkien!