Pros
It' s a real Hollywood company, there's a certain glamour and prestige from working at a company that makes major films and TV shows. The offices are generally in nice locations and well outfitted and the travel and conference perks are a plus. On the work side, there's quite a lot of potential deals coming through and the management within the business are generally smart, on the ball and co-operate with the central strategy and business development teams. The level of thinking and the way the work is presented is of a high quality, lots of smart people running around the business.
Cons
Highly bureaucratic and tiered - first there's the nesting of NBCU within Comcast, then within NBCU there's divisional tiering with multiple managers and senior executives (often on parallel tracks) in the decision path of any new initiative. Lots of mid-career managers looking to "shine" and end up using their teams to do the slogging and hard yards but without giving them the spotlight. For all the high quality work done, tough decisions are often dodged, and some necessary risks not taken. While Comcast has a name for focusing on long-term value from placing a few big bets, recent big bets have been reactive (not proactive) and sensible smaller bets are left by the wayside.