In theory I agree with you. There are a lot of bad Beatles books out there that just recapitulate the same stories that everyone knows, although you are quite wrong to lump Macdonald in with Lewisohn; Macdonald provides a highly tendentious interpretation of the Beatles' work, while all of us are indebted to Lewisohn's work in the EMI archives. I am all up for an interesting new angle on the Beatles, such as Devin McKinney's 'Magic Circles', which argues - ingeniously, if not, in my view, ultimately convincingly - that the White Album was the greatest thing the Beatles ever did.
The trouble is, David Quantick doesn't have an interesting new angle. He was a third-rate corporate hack when he worked for NME in the 80s and he's still one today. This book therefore has a double problem: Quantick hasn't unearthed any cool new stuff in the archives, but neither does he have anything refreshing or insightful to say.