I like the Assassin's Creed series of games, but not until Brotherhood and Revelations did I think it could translate well in the RPG arena, which I what I hope to do with my gaming group (for interest - my setting will be in the English Civil War)
So here's my thoughts:-
1) Coup de Grace is the best representation of the actual assassination moves - be they Air style from a rooftop or a sneaky in the back job. However a target has to be helpless to CdG. To me, a target isn't helpless if he's out in the open giving a speech, or inspecting the troops etc, he's just unaware. Should I just GM hand wave and allow the CdG.
2)If I don't hand wave as above, does spending AD to make the target helpless (i.e. usual narrative control) fit better? 1 AD for minor NPCs, 2 for major, 3 for mission target?
3)If I do tie the assassination into AD spend, am I allowing the BBEG to be taken out too easily, leading to anti-climax. I don't think so, as you could kill a lot of Altair/Ezio's targets in one hit; to me the mission was more about your approach; I'd just like to hear thoughts.