The worst part? Surely its the best. Well organised armies lose many of their advantages when fighting in broken or forested terrain. That's as it should be. Romans and Greeks will - all things being equal (ie no AI involved) - usually beat Germans and Gallic troops on flat plain and lose in a forest. To avoid that you just need to move more carefully and use the general's moral bonus effectively.
Also, from memory its the Lusotannan that actually have the strongest bonus in a forest.
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