No offense taken !
The take on the Abwehr as amateurish is the British SIS' IIRC, which always struck me because when you defeat a foe, you don't go saying "ah, they were just a bunch of amateurs", you generally want to say "we were up against the sharpest and most devious operators in the whole world, and we came up ahead in a harrowing duel of minds". So I read up a little more on the Abwehr, and about Canaris, and what I read brought me to the conclusion that by and large the SIS had been right. Even German officers reached that conclusion when the Abwehr failed to see the Allies' declaration of war over Danzig, failed to evaluate the size of the Soviet Army, failed to predict Torch and the subsequent invasion of Italy, and were led along to believe D-DAY would happen in Pas-de-Calais by agents who were turned by the SIS without the Abwehr ever suspecting anything.
Don't get me wrong, I'm not saying the Abwehr's task was easy, far from it, and they also had succesful operations, but in the end they got blindsided more often than they managed to score success. While some of the Abwehr's failures can be blamed on outside factors and influences, in some cases it was a direct consequences of lack of professionnalism. For example they had one agent who regularly sent reports about Allied forces in Great Britain. Problem is, the agent never ever set foot on the British islands, and invented the reports just by using a Baedeker travel guide and some newspaper clips. The OKW had its doubts about the intel, but the Abwehr kept backing their man, never realizing he had long been turned by the SIS.
I want to use that aspect of the Abwehr operations, because it is historically accurate from what I could gather AND because airtight operations executed by super-competent operatives are less interesting, in a story-telling perspective, than operations that can actually blow up in the Abwehr's face. The Abwehr is a dangerous foe. And it is a clever one. What I am trying to describe here is an Abwehr that is at the same time able to mount daring, cunning operations, but can also make blunders. It's like the CIA, or the DGSE, or the British Intelligence Service. Are they competent ? Sure they are ! But they also screwed up and blew it big-time in Cuba or in Auckland, or with Philby.