Pros
Bright co-workers, exciting startup-like culture, social mini-events every week, lots of good humor and laughter around the office, well-stocked beer fridge, freedom to do your job as you see fit, flexibility to work at home and leave when needed, speedy career and salary development if assertive, and great opportunities to learn by working with many kinds of businesses. Management is excellent, if busy, but they will all make time for listening to your concerns. Beginning at this agency is the best way to jumpstart a career while enjoying the process.
Cons
Since you work with many clients yet have limited time, you will inevitably frustrate some of them. You will grow a lot through agency life, but it is stressful in moments, and it feels challenging to get ahead on work. You must rely on a self-taught process to improve, as the specialists you meet tend to have a good but specific amount of knowledge. If you work hard, you should gain a middle management role, but can feel overwhelmed at times dealing with clients. Digital marketing as a field moves at a rapid pace and will be tough to keep up with anywhere. This is a chance for you to help out. Try to learn from as many people as you can, and they will all go out of their way to teach you. Study on your own too though. Know that roles outside of agency life tend to be more comprehensive in that you need to know several specialties (SEO, PPC, Display, Marketing Automation, and so forth).