RIM's leadership structure, with its co-CEOs, has been an odd one from its outset. Lazaridis and Balsillie concentrated on making a great messaging device, which the BlackBerry still is. But browser performance has never been good, and an app story has yet to materialize for the BlackBerry. Only 5% of our respondents are willing to let the CEO pair off the hook. But would someone else have done better? Not many companies invent the successor to their own market leading product.