Lettow, his officers and his men did certainly fight a brilliant campaign with very limited means against vastly superior allied forces. A guerilla war has at least one major intrinsic flaw, it has to expose the population or water into which the fish wants to swim to great harm and violence. There are just limited ways to protect the (own) people and depending on the war and the methods of the enemy even victory can be extremely costly.
From a German (Western) view waging such a guerilla war in East Africa was thus of course easier as the it was the native African population who shouldered and carried literally the war effort and did most of the dying.
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