Going down fighting, yes, but if they're mostly doing it because they simply have nothing left to live for, this isn't much of a happy ending for me. It isn't even much of a sacrifice, it's just depressing. For me the Buffy finale was heroic, because none of them wanted to die. The Angel finale was more or less a sort of collective suicide because they'd maneuvered themselves into a situation they saw no other way out of.