Pros
The vast majority of people here are intelligent, professional and great to work alongside. Former colleagues who have left Detica have since mentioned to me that they now appreciate the quality of the workforce here. In my opinion Detica is a good place to join as a graduate. People here are not afraid to bestow responsibility on graduates if they are up to the task. As other reviews mention, there is a lot of scope for quick progression early in your career. From personal experience, workplace issues and dilemmas do get successfully resolved once people talk things out with their line manager/operations manager/human resources. Detica has a fine reputation in the business consultancy and IT industries. A job here will generally enhance one's future employability.
Cons
People in middle grades can get a raw deal unless they're proactive about taking control of their career. I've seen people at this level of seniority leave because they weren't happy with what they were doing, and also because they were becoming exposed to some of the uglier sides of work here (poor work/life balance, highly politicised performance review system, etc). Cost-cutting measures, whilst understandable, seem to be happening in the wrong areas and are being undemocratically rolled out (e.g relatively low graduate starting salaries by market standards, reduction of standard benefits). It's quite palpable that staff turnover is considerably higher now than it was 5 years ago.