Niche's are really vulnerable for a game with backlash, since they need to appeal to a larger percentage of their audience. GTA 5 is more insulated against fan backlash than EU4, but GTA 5 was the first example of steam hiding a spike in negative reviews.
Easiest way to visualize this is how someone buys a new game on steam. If you go to a store page, and you see the reviews are Mixed, it will give you pause to at least go scrolling through the reviews to see why. Now bear in mind, there's a percentage of people that won't even do that, and will skip a game entirely if its Mixed on steam reviews.
Same applies for review scores, people will skip a game with a 7 or less.
Also paradox game's aren't small anymore. EU4 and the others are some of the most popular strategy games on steam.
What you said about negative reviews is definitely true, but thankfully the base game is well received on steam, it is only the DLCs that see backlash. As a new buyer you first get the base game to see if you like it, and if you really enjoy it, you might look into DLCs later. At least in my case, when I was a new player, I loved the base game, and I didn't know anything about dlcs. After a few campaigns, I decided I want to look into some of the DLCs. I searched on reddit for recommendations and everyone was saying to get Art of War (this was a couple years ago), but when I saw it on steam, it had negative/mixed reviews.. As you can imagine, I was pretty confused, since everyone was recommending it as #1 must-have dlc. So I just went to youtube and checked the features of the DLC in action, and they seemed super useful to me, so I ignored the reviews and bought it. Fast forward to today, I own everything there is to own except cosmetic packs.
If it was just a dlc for a random game with bad reviews, yes, i wouldn't have bought it, but if you like the game - and are willing to pay - why should you care about people complaining about price?
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