Running out of arguments?
Nationalism can be good if taken in a small amount, otherwise it may lead fanaticism. Your stories about glorious battles against the Turks may work good when told to a Polish audience, but don’t be surprised if foreigners don’t share your enthusiasm with the story of Kościuszko and Pułaski.
I’m sorry to make this plain to you, but Poland’s contribution to European history is generally not considered to be very important, except for school history teachers in Poland. In fact, the whole history of the world can be explained and understood without mentioning Poland a single time.
The contribution of a nation to world history can’t be measured through a series of battles and wars, there’s a lot more to it and that’s a very old fashioned way to understand history. Poland has surely its place in European history, no one denies that, but it’s not a prime one. You can not compare Poland with Russia, Germany, England, France or Spain. Those are the modern European nations that are present in CivIV. Adding Poland to that list is like putting a bottle of cooking white wine next to a bottle of Don Perignon, that’s just not right.
I think CivIV is better off without Poland. If they are going to add new civs there are many others that come before Poland, and there’re also many leaders from the existing civs that are far better choices than adding Poland, such as Charles de Gaulle or Abd al-Rahman III to name just two. Before adding a new civ to the game there has to be a good reason, otherwise the overall historical feeling of the game suffers, the more civs the better is not a good way to do things.
That’s just my opinion, I certainly don’t expect you to share it, but there’s no need to say someone doesn’t know about history just because his opinion differs from yours.