Pros
Experience can be amazing with the right team and manager, which depends on luck and a whole lot of persuading
Somewhat cool product methodologies
Cons
Meaningless work - if your quality of experience is mostly dependent on the team, it also means that work is meaningless, just constantly churning reports one after another. If you are all right with client management, report writing, and presentations then this job has decent opportunities
Work-life balance is barely there - no active reduction of workload, lots of unspoken expectations to complete work over the night and weekend. Again this depends on the team
Extremely limited in technical skills growth - most work is outsourced to vendors in favour of squeezing timelines. Only emphasis is placed on learning about Kantar's products, but none on basic research methodologies and analytical methods important for the industry which limits career progression
Hardly any skills differentiation between employees of the same level, only difference is the client account you do which can be a plus point for those thinking about jumping to the client side
Managing operations is tedious and executives need a lot of handholding