Here some reasons for such low rating on Glassdorr
Pros
ATCC has an excellent reputation and the company has an important impact in supporting global research. The products from ATCC are excellent.
Cons
Recently, ATCC have reduced the sick leave accrual from 12 to 5 days per year. Salaries are quite low and other biotech companies in the area are offering much better package (please check on Glassdoor). The new ERP system was a disaster that affected employees productivity and customer service. Any process in the company is brutally slow, you need hours at the phone and write dozens of emails to get something moving. Needless to say, like many reviews have already explained: the management is extremely poor. The HR office was excellent in the past, but unfortunately there was a turnover the last year, and such office is became very unsupportive and unprofessional.