I picked this one up based on a previous reading of DeFelice's, "Omar Bradley: General at War," and an interest in early Army Ranger history.
While "Rangers at Dieppe: The First Combat Action of U.S. Army Rangers in World War II" is a passable piece of history, it's no "Omar Bradley: General at War" and would have been better served with fewer interstitial, personal anecdotes from the author and more... well, history.
If you're looking for a history of the raid on Dieppe, there are other, better books out there. If you're simply wanting to put flesh on the bones of early Army Ranger history, I suppose you'll need to add this to your list, despite its shortcomings.