If you have to give feedback on anything (from the company to your manager to your colleagues to your office mate), always always give a positive feedback. Tell them the company is great, the manager was supportive, the colleagues were easy to work with like a nice big family where everyone got along and helped each other, the office mate was nice. Why? Cause these days, your background and other documents are online and can be obtained by others. So if you plan to go on working somewhere else, or even need to get back into the same company, or transfer internally to a different group, you don't want anything negative you said on a feedback/survey to prevent you from getting a job. If you want to complain about the company and colleague, just share it with your spouse and family. No one else, not even your friends. We all already know what these big corporations are like. They totally are horrible/unfair/bias/etc and it can get frustrating to work with some people in the group. But keep it to yourself, cause you don't want it written and recorded for the online internet public.