Overall, GSK is a wonderful place to work with fairly decent work/life balance, excellent benefits and a CEO who genuinely cares about his employees and making ethically sound decisions. In the wake of recent events, however, the company has announced that several senior leaders will be retiring - including our venerable CEO. This creates an uncertain environment as the rationale behind these early retirements is questioned. GSK works hard to adhere to company values, and at present, senior leaders do a nice job of pulling these though in key decisions.
As with any company - the caliber of management (mid-level and senior) can be hit or miss - but there at least seems to be some effort to hire and promote those who exhibit behaviors consistent with corporate values and expectations. Important to note: since the 2014 consolidations, the number of available growth opportunities at GSK has gone down. The hope is that the company will rebound soon!