As for myself, I only need to know the pairing and appreciate a warning for character death. That's because I really cannot abide character death of Aragorn or Frodo in a story, and if I'm reading a story and that is involved and I invested my precious time reading it and was not informed and am now a grumbling, depressed, crying mass of neoplasm because of the fic---well---that usually just makes me upset at the author.

However, there are all sorts of things that squick people, and I've discovered on various lists and groups and here that if I have non-con, het, child abuse, extreme medical detail, or anything else "unusual" that I'd best put a warning on it or I'm going to piss an awful lot of people off. There are many more people upset by lack of warnings than by spoilers posted, and I have a lot of people on my flist that I *know* avoid certain things.

Maybe if I didn't know these people personally, I might not be as good with warnings, but I do it in an attempt to spare my flist from things I know they'd prefer not to read. And I think warnings are really common courtesy to people.