But we all have some ability to at least influence, if not necessarily control, the workplace we inhabit for so many hours each week. How we interact with our supervisors and co-workers can have a tremendous effect on how pleasant the workplace is, as well as the trajectory of our own careers. How you affect your work zone can affect more than your current position - it can affect your future career path, both at the company you work for and future opportunities. Misunderstandings can sink projects, and oftentimes goals and timelines change because of other issues within the company. If you are inadvertently doing something incorrectly, the sooner you find out the better.
Most people tend to put a lot of emphasis on work evaluations.
Rather than getting upset about any negative points your supervisor brings to your attention, use them as an opportunity to make changes. Keep in mind that they're just one person's opinion of you. At the same time, be open-minded and solicit feedback on both what you are doing well and what areas could use improvement. Within reason, try to keep in the boss's good graces. Flattery isn't necessary, but respect is appreciated.