Mountbatten as an example of patronage and rapid promotion

Why do some discussions of the Royal Navy treat Lord Mountbatten so critically?

The criticism concerns patronage and rapid promotion that became self-reinforcing, with previous advancement creating pressure to find Mountbatten further senior roles.

Mountbatten's career is treated here as an example of patronage within the British system. The criticism concerns promotion that became self-reinforcing: prior advancement created pressure to find another senior role. It also reflects the difficulty of deciding what to do with someone who had already risen rapidly. This interpretation explains the hostility in terms of appointments and institutional habits, without claiming that everyone personally hated him.