McDonald's hasn't been lovin' it for some time. Sales are sliding, revenue is down, and fast-casual chains are booming. Its image needs a major refresh. Which is why the fast-food behemoth yesterday announced a new global chief marketing officer, former Bacardi CMO Silvia Lagnado. CEO Steve Easterbrook, who joined the company in March, charged Lagnado with positioning McDonald's as a "modern, progressive burger company."