I wasn't blown away with it. Annoys me when they referred to the breaking of "codes" all through the program, when in fact they should say cipher. A cipher is the substituting of letters with another by using an algorithm, hence they can be cracked. A code is a a letter or word being substituted by another from a code book. Unless the enemy has the code book, it can't be cracked. A simple example, the code word for Berlin is "donkey". If a German agent, listening outside the open window of "Bomber" Harris's office, heard him say on the phone, "The target tonight is donkey", no computer anywhere would "crack" that donkey meant Berlin.
Also, it referred to the Bismark as a battle cruiser when it was a battleship. Additionally it said the Hood was Britain's most modern ship, when in fact it was already obsolescent by the time the war started.