This book follows my reading of E.B. Potter's excellent biographies of admirals Chester Nimitz and Bull Halsey. Potter's admiration for the men shines through, but it's subtle and is a result of an accurate rendering of events, actions, and correspondence. The reader can draw conclusions from the facts about the subjects, not the personal feeling of the biographer.
Not so with Manchester. He is open with his worship of Churchill and his loathing for those who stood against him. It's understandable that he would have personal animosity towards those who helped throw Europe into chaos, but the facts would be damning enough without playing cute stylistic tricks with them.