On a new assignment, while the client is trying to slowly adopt Scrum (and hence Agile), I have been bothered by the needless time tracking that is proposed by some of the Scrum templates and related literature .
Tracking hours remaining at a task level, or even %age task completion to me is useless. Either a user story is done or not done, simply because you cant do much with a half baked story. A story which is done contributes to the velocity or throughput. Everything else is inventory.