PlayStation. Walgreens. Lowe's. Carlsberg. Coach. Sony. Groupe PSA. From 2016 through late 2017, several of OMD's most valuable accounts fell like dominos as the industry-wide string of big-budget reviews continued apace. The Omnicom Media Group hub remains, by most estimates, the world's largest media network--but after a decade-long run atop the heap, it ranked dead...
