Pros
Medical Insurance is best amongst its peers. Job security is higher than its peers. Onsite opportunity is higher than its peers. Access to many good Learning platforms and certifications reimbursement possible. As it is a big company with huge number of employees, networking for professional needs is easier. Tata code of conduct is reflected in the top management's values. Even during covid times, they didn't fire anybody and gave salary to all. If you are looking for a long term engagement with a good work life balance, then this is the place to work.
Cons
Your career development solely depends on the kind of project/account that you end up with. Once you get into an account, switching between accounts in search of career development or dispute with managers is a painful process. The appraisal hike is peanuts. Promotion hike is a slightly bigger peanut. Still a peanut. There are a lot of mid level managers in the organization that you will encounter everywhere. They will set meaningless goals in the virtue of improving the account which will be on your head thanks to the appraisal process.