I can recommend the book The Men Who Lost America, by Andrew O'Shaughnessy. It gives a more balanced and objective view of the British cause in the revolution.

It profiles the leaders of the British side, including Cornwallis, Howe, Clinton (the British generals who would be familiar to America), as well as the less familiar political leadership in N. America and back in London, such as Guy Carleton, Governor of Quebec, Prime Minister Lord North, and of course King George III.

The British leaders were for the most part the cream of their respective professions, skilled in their jobs with previous military, administrative and/or political experience, and hardly incompetent or indecisive. They did not expect a long campaign at first, and believed (incorrectly, as it turned out) that a surge of loyalist support in the 13 colonies would side with the redcoats and overwhelm the patriot cause.

The abolitionist cause had taken root in Britain in the latter part of the 18th century, so the British scheme of recruiting escaped slaves to fight on the British side to win their freedom was both a shrewd wartime tactic, and reflected the emergence of the anti-slavery movement. Many native peoples too found common cause with Britain, who promised to halt western settlement and create a future native homeland. Liberty had an entirely different meaning for those disenfranchised in America.

Logistical problems, conflicting strategic goals among competing statesmen on both sides of the Atlantic, and political decisions made in Parliament all had inadvertently impacted British efforts in the field and their capacity to achieve victory in the revolution.

And losing the war didn't appear to harm their careers either, as most moved on to influential positions.