It's amazing that you wrote 500 words without providing any actual reasons why you prefer Civ III or dislike Civ IV. All you did was make up an argument (Civ III was weak because you need to mod it! Civ IV Is awesome once it's modded!) that no one actually made. I didn't play very much Civ IV vanilla, but I played an unreal amount of Civ III, and loved it. But that game was nowhere near as good as BTS.