Pros
The breadth and range of experience to be gained is better than most other publishing companies. The rating of 2 stars is generous and has been given purely for the professional experience. The name and brand of the publisher could be helpful for your CV.
Cons
Everything else is a con. The line management micromanage you, treat you like slaves, bully you and the senior management and HR are all complicit in this - basically they don't care. At best, the work is demanding. Morale is low, there are promises of progression in the future which never materialise. However more senior management continue to progress professionally and in job titles. The work culture is largely cold, although there are some friendly people in other departments. There are people doing the same job/duties in the same department with completely different salaries. This is completely down to the manager to decide and there is no structure in place for equal pay for the same role i.e. banding. Some production editors were making £35K+ per year and less assertive PEs were paid £20K per year for the exact same job (the same as the production assistant).