At one time people "were' truly happy to work for Genzyme, that all changed in 2007! And it has steadily gotten worse since. Now people are always on edge, walking on egg shells, management has been out of touch with the real beat on the streets for many years. They will actually use the following "articulate" phrase addressing the assembly: "If you do not like it, then you should be looking for a job elsewhere". It was already getting chaotic and then the company was bought by Sanofi. Sanofi wants to "harmonize" operations. Which sounds good, sounds all warm and fuzzy but what works for the pharmaceutical industry may not be advantageous for the Biotech industry. The fear of Sanofi by Genzyme Management has them running around with inappropriate agendas which it is transparent that the Genzyme Management is in fear of losing their positions and are in self preservation mode.
Times are turbulent, perhaps after all of the dust settles in some 5 years or so it will be okay to work there again. The HR personnel are merely mouthpieces for management; sure they will explain your benefits but if you have any grievances with any superiors (as this has been shared to me by multiple people who have attempted) you are just setting your self up for misery. HR will maintain a bias for management and do not have your best interest in mind!
With the rapid growth of the company came growing pains. Pains which they have failed to overcome to this day such as lack of meaningful communication between departments/groups; often there are details which are not shared and contributes to confusion etc.
