Pros
Autonomy, you are given the space and tools to build up your skills and take risks. Over 4 years I was able to try my hand at various techniques and build several skills, and built a body of work I am proud of. The relationships I built there, still flourish, and any disagreements were quickly replaced by the ever present deadline. Perhaps it's the mindset of individual, but my experience was not dwelling on things. Follow the 3 "gets" Get in, Get it Done, and Get out, and you are going to have a great working experience.
It being a full service shop, you may be able to cross over and see what the other departments are doing, and familiarize yourself with a completely different workflow. However, that is entirely dependent on the individual, no one will hold your hand and walk you over to another department and make you care enough to find out with the company as a whole is doing.
Much like life, this shop is all about what you make of it. Perhaps the outcome isn't what you expected, but how often are plans carried out flawlessly? There are kinks in every piece of armor, that's where your evasion, tact, and skill come into play.
Cons
Every shop has cons and we all know what they are. Ask yourself what you bring to the table, and if you feel under appreciated, find a place that does appreciate you. Dedication and hard work will never disappoint you, even if employers do.