Pros
Very bright, assertive, talented people. Big budgets, opportunities to work on large projects in a variety of formats. Pays fairly well, but make sure to come in as high as possible because promotions and raises are only for the loudest noisemakers and people who show steady results and growth over time are ignored. Flexible schedules.
Cons
Without a disciplined structure all those talented, assertive people walk all over each other and spend more time fighting amongst themselves than against the competition. Huge wastes of time, energy, enthusiasm, and ultimately, money. No continuity in planning over time - the latest, coolest, most exciting thing gets the attention whenever new leadership comes in. Existing projects, priorities and people are scrapped. Expect nothing to last more than 6 months.