Pros
Lots of office banter if that is your thing (just be prepared to be offended a lotif you have any protected characteristics). Can get away with doing fairly little work if you are loud and play your cards right/get on with the right people.
Cons
Poor salary/pension. Office is a dump. Gross kitchens/carpets/toilets (literally ants in toilets)/stuff dumped everywhere and no office organisation. Management is oblivious to reality. Full of pointy-haired bosses and MI obsessed 'leaders' with no idea of what their decisions mean for the boots on the ground. Full of big egos who make all the noises about being team players but never lift a finger to help the people doing the actual work. Really high staff turnover. If you aren't loud and brash then you end up with ALL the work and they will keep dumping it on you until you burn out with no reward. Processes would change constantly, you would be told to do things differently on a day to day basis. Pointless meeting/'huddle' culture. Hours wasted between the team each week giving pointless updates. Some really bad hiring decisions (and then they wonder why things went wrong).