A major determinant in whether Steam members who happen to wander onto the Thirty Years War page actually buy the game or not is the presence of positive reviews. These are especially important to drown out the few internet trolls who will inevitably write reviews before they claim their refunds.
I've been focusing on other things for the past few months, so I don't feel I remember the game well enough to write a review until I've played the game enough to refresh my memory.
But for anyone who wants to write one, the review doesn't have to be that long and ninety percent of the people who read them don't look at more than three sentences (that's usually all they can see if they don't click on the 'read more' button).
So what people care about in those first three sentences is that you think the game is good (not that the reader thinks your opinion counts for anything), it's turn-based and not RTS, the AI is good (this is important to mention), the map is accurate and fun to look at, and the game is fun to play.
And all of that probably won't fit in the first four lines, so by the time you're done saying that, the review will be finished. Just make sure that good AI and turn-based are in the first or second line.
If you decide that you want to mention that the game is historical rather than fantasy based, you might leave that for the fifth or sixth line because a lot of people (e.g. most of those who buy Europa Universalis) seem to have a phobia about playing anything based on real history (perhaps something like 'an exciting way to explore alternate history' would do the trick).
There' a mind-numbingly large number of buyers on Steam, and though most of them won't even look twice at a game like this, if you can attract a few of them it will channel enough money into this game that DLC expansions (like the tail end of the eighty years war or the territorial and dynastic disputes between Poland and Sweden) will start to make economic sense. TYW has a great map, and I want to see more of it get used during this period. ECW anyone ? If you want to see it happen, get your Steam key and write a review.