Spoilers for Book 6. In choosing his side in the war, Prof. Snape is taking risks that no one - not the Order, not the Death Eaters - can guess.
(#) Amaranthea 2006-06-03 08:53:09 AMA solid view of a post-war Snape. Your characterization of him as a man who, instead of bitter, is merely tired, seems spot-on to me.
Also your inclusion of Snape's quiet disgust for the ignorance of some individuals (namely Hermione and Harry) seemed true to character.