Built the Great Wall in an Emperor game and got a great spy. Invested it on the tech leader and selectively stole techs from him. A great spy can give you 9,000 points or so. I am able to steal from him at 59% of cost, so that the great spy is as good as 4-5 techs. I got COL, Currency already and still have 6000 points left against his measly 300 points.
I feel that at least in the early game period, a great spy is far more powerful than other GPs. That makes the Great wall a great wonder, even greater than the Oracle.
I feel that at least in the early game period, a great spy is far more powerful than other GPs. That makes the Great wall a great wonder, even greater than the Oracle.