A weak matrix organization is often the least supportive environment for project managers. Here the employees, your project team, are associated with functional managers that are responsible for their development and management. The work the functional managers assign often become the primary work and project work takes a back seat -- after all, they want to please the person that is going to provide a promotion. Also, since the project manager has absolutely no authority over these resources, if something goes wrong, the project manager needs to rely on the functional managers to fix the issues. And things will go wrong if there is more work than can be fulfilled or the employees feel they are not receiving the attention they deserve from their functional manager. A projectized organization or even a strong matrix would be a better environment for the project manager.