Guderian, probably the best & most practical panzer leader out of all generals; thought it was better to mass produce the STUG- using PzIII chassis and PzIV as the main tank than wasting the resources on the monsters, history has proven him right.
Better to have 10,000 STUG and 5,000 Pz IV than 6,500 unreliable Panther, Tiger, King Tiger and all other idiotic ones.
And the thing was the STUG and Pz IV (when armed with the KwK42- 75mm) were good enough to take on most allied tanks, also very cheap, decent on and off road mobility and speed, much lower fuel consumption (very important).
The Panther was unreliable because it was rushed in. After the issues with the suspension, engine and transmission were fixed it was a deadly efficient tank. Hitler should have waited 6-8 more months to let his engineers sort out the problems and THEN send the Panther to the front. Same goes for the Tiger. It was rushed in but when the problems the design had when it was first used were sorted out the Tiger was highly efficient in killing poor Shermans and T-34s. And for a design that could not be upgraded that much as the Panzer IV it was a success.
What killed the german tankforces was that the enemy had more tanks and personell to man them.
A different approach could have been to amass all the Tigers in 4-5 Tiger-Panzerdivisions (HArm Divisions in HoI III - I love them :3) as spearheads instead of just give every single panzerdivision only a few Tigers and have the incompetent Himmler most of them in his toy army. Imaging the units of Rokossovsky's Belorussian Front in Summer '44 facing the well hidden, nearly invulnerable sledgehammer to beat the crap out of their T-34/76/85s and Is-2s. Having 400-500 operational Tigers on the Ostfront is not that far fetched if the Tiger was only used there and not clustered all over the european theatre.
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The Tiger II is just a different matter. It weighs almost as much as two Panzer IV H and ate a lot of resources, maintainance capacity and fuel. It could not cross most bridges - especially in France and Italy - and if the engine broke or the tracks in combat, well - 80 tons immobile metal with a smoking engine are not useful when facing an enemy tank. Even if that monster was even more deadly than the Tiger I consider the Tiger II an overall design failure. Its flaws offset its main advantage: The 8,8 cm L71. That gun was just perfect in killing every enemy tank - including heavily armored tank destroyers.
These problems also count for the Ferdinand/Elefant, the Maus prot and the various design studies we can play in WoT (Löwe, E75, E100, Vk 45.02 A/B, etc).
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