Don't play any DLC until you get bored with the game. Then buy it piecemeal as sales come. That makes the game entertaining for a longer period of time.
Witness my weakness, highlighted by the growth of the tiny-icons-list on the left *) ...
As I realized after my first playing attempts (comparing them whith what was shown in the videos I watched), what the bullet point "Provincial improvements with development system" really meant ... I went to the shop and purchased 'Common Sense' right away.
Maybe this wasn't the best call, as 'Art of War' was reccomended more often. But I really like the idea of developing my regions and I was quite puzzeled by the missing buttons. Well, here we go.
Anyway, I promise to honor your recommendations from now on and stay away from further purchases until later.
Speaking of purchasing later and making use of sales to do so - I didn't follow Paradox' pricing politics very closely so far. The current price reduction seems quite good (75% for the base game, about 50% for DLCs). Is this as high as it ever gets or were there occasions when the DLCs got reduced by 75% as well? When it is worth hitting the 'buy now' button?
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*) Edit: To be updated later, when I actually install the DLC this evening.
I was abut to post the very same question as the op. Glad I did a quick search first but I have to disagree with some of the comments about new players not needing the DLC's
I've spend quite a few hours watching lets plays and tutorials (Arumba and Filth's are great) but almost all of them use mechanics which aren't available without the correct DLC.
Every time I ask a question like.... How do I reduce liberty desire.... The answer is part of a DLC. Counter spying, Privateering.... So many of these things now seem essential.
I tried playing along with Arumba's tutorial as Scotland but it's almost impossible to earn enough cash to stay afloat without the perks that the DLC's offer. I'm sure someone with more experience than me would manage no problem but every time I try to search for help for a specific problem the answer almost always requires a DLC.
So I'll modify my question. Which DLC's give the best preks for a new player?