I had a job I hated, but when my boss left I was able to build a great working partnership with the new manager.   I know because my boss was so unhappy, it seeped to me and made me unhappy.   The tone around you can totally affect everyone.  I am happy to say an upbeat and just really nice person took his place and the job became one of the best I had.  I left to find a better paying job and miss how that job turned out.