Acxiom also had trouble explaining the value of its solutions, one of those people said. For instance, at one point, only one client used its rTAG product, which was designed to help clients build identity graphs.“I was trying to understand when they were trying to pitch rTAG to clients, and even I couldn’t get a straight answer to why this would be valuable,” this person said. “No one could tell the story, because there was no story.”The IPG spokesperson said that now, most of the large enterprise clients (those who…