It is a (very) well known problem in software development that as the scale of a project increases it becomes disproportionately more difficult to manage the project to a successful outcome. As more and more gaming projects reach 100+ person development teams and $20 Million to $40 Million budgets you will see more and more previously good/great developers produce crappy games because they simply can not handle the scale of the project.
I'm not trying to bash these developers but you have to realize that it is a completely different to manage a team of 15 developers to product a N64/Nintendo DS game over 12 months than it is to manage a team of 100+ developers for 2+ years to produce an Epic PS3/XBox 360 game. These large projects will (likely) be broken down into multiple teams (8 to 10, 10 to 15 man teams) each with its own manager, with many of these managers reporting to an art lead or to the project manager, and any problems in management will result in a lower quality product.
