The comics world would be a million times better if noone had been redirected.
There's never been a good ressurection story in comics.
If it was part of a good story, sure, keep them dead. No one's asking for Gwen Stacey, Uncle Ben or Mar'Vehl to come back (so Marvel, please find some other way to hold onto your "Captain Marvel" trademark). I was excited about a MU without Steve Rogers as Captain America and was saddened by Flash's death in Crisis.
If, on the other hand, it's part of a lame story, then I'm okay if someone wants to fix it (and I know that's subjective). There's some characters that shouldn't have been killed off, their death was horribly written/tacked onto a story to make it sell better, left intentionally vague, etc. Wally West comes to mind, as does Synch, Banshee, Ultimate Spider-Man (the first time he "died"), everyone in Ultimatium, etc.