One problem could be flies. Maggots only take about 3 days to hatch. I have been told that the main reason for bad tasting meat is the distance the deer ran before it dies. They get a build up of adrenalin in the muscles which taints the meat. You can tell if that is the case when you quarter it. It will have holes in the rump meat if a lot of adrenalin has been injected.

X-Pat Brit Livin the good life in NC