Wow. Just read all 400+ posts in this thread, and I've got to say that I've been convinced, despite only coming into the thread to see why anyone would want Poland as a civ. But there are a number of very good points that I've seen.
1) Continuous national identity.
In all the maps from the various eras, up until modern day, Poland has been Polish. It's been allied with other nations, it's been conquered by other nations, but in the end, it's remained Polish, and its own nation. It has never risen again as someone else. Can't say that about a number of civilizations that we play with now, much less some of the suggestions.
2) Regional significance.
I think that part of the reason that many folks don't see its influence on the world is because they're only looking at its influence on Western European culture. Sure, that's not where its main influence lies -- it's in Eastern Europe. I don't think that anyone disputes China's status as a civilization, despite the fact that it has never invaded England. China didn't break up the Roman empire. China didn't found New York. This wasn't where China's influence was felt, but it doesn't reduce its status as an in-game civilization. I think that it's just that China is far enough away that people feel "of
course they didn't", whereas Poland is part of Europe. It's just that its a
different part of Europe.
3) Sheer size of its dominion.
It's risen and fallen in size, but even looking at just Poland during its heyday, and ignoring the rest of its alliance partners and vassals, it at least matched France, Germany, and Spain. Throw in Lithuania and the other territories, and it's
big. Not Roman Empire big, no, but still, it counts as an empire.
4) There's room for it.
Despite an oversized Western Europe on pretty much all world maps for the game, there just isn't any space to add the Netherlands or Portugal. It's already pretty hard to do much with Spain, with their midgame UU and no room to expand. What's Portugal going to do? Just duke it out with Spain for control of the Iberian peninsula? It will just slow down the winner, and they'll control the same space as one civ. Same problem with the Netherlands and France. Any Mediterranean or Middle Eastern civ will have a similar problem.
There is, in fact, room between Germany and Russia though, especially considering this map
here, which I have so totally bookmarked. They should be able to get four or five cities in there. Germany will be hemmed in a bit more, and Russia will have to do more northern and eastern expansion, but they'll just have to suck it up.
4) Genuine empire.
It sounds like much of the Polish empire was built through diplomacy, rather than through conquest. It still counts. They have certainly had their share of wars, and have been victorious enough. Their diplomacy was backed by a solid military, as we've seen shown. They certainly weren't a piddly do-nothing country like some would have us believe. And they seem to have had a solid cultural backing as well. All these things are able to be emulated in the game.
Anyways.....
As for being "backwards" at the time of the Renaissance, one of the more ludicrous claims against them that I've seen, as there has been no evidence that they were in any way culturally inferior to Western Europe, as a nearly landlocked nation, it wasn't out exploring the new world like Portugal, England, Spain, or the Netherlands. That wasn't their game. Portugal and Holland, both apparently preferred to Poland, were tiny nations on the coast, surrounded by stronger militaries -- what else could they have done? And apparently, Poland played even that game a little bit. Once economic empires are established in the game (which would be soooo sweet), I'd love to see some of those. But for now, that's not really an option.
So, yeah, I'd say that after all the information we've been given, Poland would make an excellent addition in a new expansion pack. Toss in Babylon, Ethiopia, Polynesia, two American civs, and one more African civ, and I think we'd have a winning package. Sorry to the Netherlands and Portugal, but honestly, those were mostly added to Civ 3 for that one "New World" scenario. Get the tools to make trading and colonialism work, and I'm all over them, but for right now, they just don't make sense to add in.
--Quornix