[Point Point]

Actually it was von Manstein that was the architect of the French campaign. His theory was that the French commanders would be married to the past assumption that any invader would attack them directly on the Maginot Line. Manstein took advantage of this thinking by having the main thrust through the Ardennes forest, which would then be the "path of least resistance". In fact, they used von Leeb's forces to make a feint on the Maginot line (in order to reinforce in the French command's mind that their assumptions were correct) while Guderian drove through very rapidly through the Ardennes in the main attack. Funny how Guderian was always the one doing the main attack. They used him for the main attack in the Eastern front as well.

Rundstedt was the top German general in the French invasion. Guderian was the main attacker (the main wing). Von Leeb was the decoy along the Maginot line (the left wing). Von Leeb was the decoy (on the right wing). This triple wing approach had the effect of France getting forced to spread its defensive front thus insuring success for Guderian down the middle. Manstein was a true genius in the same league as MacArthur and Genghis Khan. Hitler immediately saw merit in Manstein's plan while most of the other generals didn't like it.

And yes, Hitler was a poor commander. He was the guy who ordered Rommel to stand his ground in Tobruk when the optimal play was to retreat in order to shorten their over extended supply lines. Hitler was a fan of Napoleon's maxims which emphasized attacking even when beat. In fact, the dates during which he initiated his attack on Russia was approximately the same as Napoleon's attack. I'm sure there's a free copy of Napoleon's maxims on Google books. You'll see why Hitler kept getting beat with over extended supply lines both in North Africa and the Eastern front. He thought it was positive EV to let his soldier stand their ground because the gains in morale would be bigger than any tactical advantage gained by retreating and then waiting for the Allies to attack and overextend their own supply lines.

Another proof that Hitler sucked as a commander was that he didn't pursue the British on Dunkirk. Those were the same guys that held Britain throughout the war and came back years later with the Americans on D-Day. Hitler's excuse was that they had gained too much ground too soon during the invasion. He also claimed to know the terrain because he served their during World War I. Almost any expert knows the German messed up in Dunkirk.