Unfortunately you will spend a lot of time working below individuals a couple of steps higher up the food chain than you and supporting a tangible lack of skill and ability. Quite often these people would have been promoted into positions they are stuck in with not much hope of advancing further, and you will stay below working for them until they leave of their own accord. It appears that they have been promoted into these positions through being at the company for 10+ years rather than any thorough knowledge or expertise in their role.
This is a company where sideways moves into different departments are encouraged which is not necessarily a bad thing, however in this case it is a bad thing due to the fact you will be unable to consider longer terms within your department through lack of roles available (when people have left these roles have been removed completely) and lack of a raise of salary to match your promotion or increase in responsibilities. Demands on workload will remain the same or increase in general.
Middle and lower management decisions seem flimsey, ill-informed and knee jerk at best, there is a lack of uptake on training in changing technologys, knowledge of responsibilities of those they manage and deep fear of change pervades this area of management pointedly in the lower areas. Higher management individual roles are constantly changing with no new roles being created lower down. HR focus on a large amount of paperwork regarding reviews and internal moves but do very little to monitor the outcomes of these new procedures.