I'd like to know what happens with the rest of the world while these finishing moves happens.
- Do NPC's keep moving? If they don't, it will look quite out of place for the longer finishing moves to seem them frozen in action.
- Can you get attacked by someone else while they are in progress, without being able to control your character?
If they stuff it up, I can see this being a major annoyance. I don't think it's a good idea in an open world game, I can see it causing problems.
If they give an option to avoid it, it would be nice to be able to have it turned totally off. Having to interrupt it by pressing a key/button each time will be irritating.
Still questionable whether or not finishers are optional and how many of these "monsters" force a third person cam-kill.
I don't see how your quote answers those questions either, yet you made the title like it did..?
I understand your concern about it though.