Most English speakers would describe meat that had a bad TASTE by saying, "the meat has gone bad", "the meat has gone off" or "the meat tastes rancid". The word "rotten" would be used for food is in a noticeable STATE OF DECAY. Words such as putrid, foul and rank would be used to describe a bad SMELL. Hope this helps

I agree with Naomi’s answer, but I would add that your suggestion of “was spoiled” would sound very natural and that “rancid” is fairly uncommon in U.S. English.