Ventajas
Amazing company to work for. Very easy going environment. A lot of concern for employees and overall a very dynamic environment.
Desventajas
Shell is a huge company, operating in more than 100 companies. So the things I am about to mention are not representative of Shell as a whole, rather, it would vary from location to location and team to team. I worked for the marketing finance team. There is a huge focus on networking, at times, it felt that there is more emphasis on networking with peers and leaders than the quality of your work itself. There is no succession planning, if there is any, then it is never discussed with the employees. There is a clear discrimination between permanent staff and contract staff, due to legal requirements or some other reason. There are a lot of people working as 3rd party employees, and they are altogether ignored when away days or other fun events are planned, which demoralizes their morale and also impacts the team's performance. Finally, there are fewer opportunities for promotions. a lot of times, you won't find the higher group job in your country.