Like many people have said here, reputation matters. At multiple airlines, I have been asked by hiring managers about prospective hires. This is serious stuff. Its an opportunity to have a hugely significant impact on someone's life and that of their family. Where they raise their kids, whether they can afford to buy a home, what age they can retire, etc. I DO NOT take it lightly. I never give a review based on whether or not I personally like and/or get along with someone. I will give an honest review of their work ethic, quality of work, timeliness, etc. If I don't have pretty strong, educated, objective opinion either negative or positive I will just say I don't know them well enough to have a comment. If someone shows up to work on time, does their job well, and I can count on them to help me out during a stressful shift when I need help, then I don't care if you're an a**hole. You will get a good review from me. Don't get me wrong, being likeable does matter. I just think it matters more than it should and people should remember that when their opinion is asked and someone's livelihood is at stake.