I've played quite a bit of Field of Glory 2 and had this game on my wishlist for a while now because the Thirty Years War interests me and now, while it was on sale, I finally bought it. I can imagine that a lot of people are put off by the steep learning curve and pretty high difficulty of this game, especially if you are not used to similar games, but I think that P&S might be even more addictive than FOG2 once you get a couple hours in. You have to get used to a couple game mechanics that seem a bit strange in the beginning, like your units choosing nearby primary attack targets which need to be attacked unless you move your unit to a different position, but overall the rules of the game are pretty logical. The constant barrage of gun salvos between your army and the enemy adds a layer of unpredictability and action to the game which isn't meant negatively. While in other games you can plan all your moves ahead, here you need to think twice before you move a unit because they might get shot at three seperate times and have their morale broken before you can move them again.
The full price is pretty high but when it's on sale, you love difficult tactical games and are looking for a good game that covers the Thirty Years War then I can wholeheartedly recommend you this game.