@GUTENTAAAAG They can be useful, but the allied tanks are extremely prone to infantry rush and there ain't a thing you can do about it. Axis tanks are not. there is a huge advantage to the axis tanks it's a bit ridiculous. You can be much more aggressive in Panzer 4 than you can in the Valentine MK.
That's not to say Panzer 4 are impossible to rush. They are just much more difficult to rush. If you're a decent tank driver, you won't be destroyed by AT mines or Dynamite in an Axis tank. But you definitely can be in a Valentine.