Pros
Nice place to work, great co-workers, get to work on products that are in millions households and TV and digital home products are fun. Really good benefits, isn't a sweatshop like comparable tech jobs. It's nice lately to have new acquaintances friend or family tell you they've notice the customer service is getting better. The company really did committed to turning that around about 5 years ago, it's the equivalent of turning a giant ship but a few years on, the progress is noticeable. Company does great philanthropic work and work for underserved communities that they don't get enough credit for. Also a very open and welcome workplace for diversity.
Cons
Lots of reorgs, budget squeezes, power point decks, corporate speak and leaders growing their fiefdoms and jousting with other leaders for dominance. Typical corporate stuff though, and I don't think the culture is as bad as it is at many other very large corporations. The company is going through a bit of an identity crisis, as the Comcast corporation continues to diversity its portfolio and footprint with Sky and NCBU, while the Xfinity brand can't decide if it wants to be a tech company on par with Google or Apple, and keeps trying to do things to get there but seems too afraid to commit.