This may be true for you, and I think it's unfortunate that you don't find the game to your liking anymore, but there is nothing to suggest your experience is shared by the majority of people who complained about the changes, and quite a lot to suggest that it isn't.
What precisely is it that makes the game unplayable for you now, if I may ask?
wel where to start, ok i was very exited to read all the dev diares and they all sounded super cool to me. so yes on day 1 i was very exited bought the new dlc instandly and started my campaign with france iirc, note that im not close to an expert player, i considder myself informed but avarage player. my ultimate goal was to someday conquer the world with a huge nation, in the proces collect as many archievements as possible to learn different aspects of the game. so to be clear, for me the game was already very challenging even though i played 1200 hours of it. to sum up my experiences with common sence i tried france, castille, brandenburg, ottoman, england, ming, japan, vagyagayagaygara and 1 or 2 more countrys i like. none of them got past 1550 most i quited around 1500.
so its not that i didnt like the ideas of common sence, but ingame they yust didnt work out as i thought they would. yes my progress was so much slower then all my previous games in previous patches, and after reading up on it it got confirmed that the gamedesign was ment to be much more difficult. as you can see that in this case for me the ultimate goal was completely taken away. not with 3000 hours am i gona archieve that.
the extras common sence brought didnt work out either, development totaly pointless when u wanna expand as fast as possible, forts, wel u know rebbel scum and i really still dont get there influence area's, all my lovely unique buildings are gone. new buildings look pointless: 1 you have lots of money to create more money¿, 2 running out of building slots way too fast.
oh yeah 1 thing that reminded me of my ottoman game, was pretty cool at first: i released persia as a opm, and hey i got half of timmys territory to join persia when they rebelled, cool time to intregrate right? wrong i dont remember the exact time and cost, but heck u can see what i mean, if u compare that cost to pre cs.
what botheres me about paradox so much, wel i saw a million complaints all over the place, and yes i mostly joined the conversation because i was so stunned about this different game called eu4, but not a single response from paradox, wel i couldn keep up with all the posts so some might have gotten by me, then this community who saiz i have to go back to previous pathc and stop bitching, for the last time, NO i loved how eu4 developed until cs, so i wanted to be upto date and enjoy new patches as they came along. wel and then you have those who say, hey what do you want free coring cost to make it fun? heck where where those people complaining pre cs about coring cost being to cheap? u cant dictate how difficult the game is for ME. also i hate the fact that these HUGE changes never where discussed in the devdiares. and where simply forced down my u know what.
ok to sum up: best game ever for me, until cs. i already proposed different difficulty settings for ironman, but apperently im dumb as a monkey by saying that, so yeah end game i suppose
bil