A quick summary from a post I made in a different
thread:
Paradox has changed a base mechanic (buildings) for everybody. People with the DLC will on average in a normal game build around 3-4 buildings more. Complaints are:
A: They changed a mechanic, they should not be allow to do this. - This is mostly the DLC/Expansion pack discussion that has been done to death before. This has nothing to do with a DLC/non-DLC split. In addition, it is silly to support the expansion pack system but be angry when people that reverting to a previous patch will do this very thing.
B: I don't like the new building mechanic. - Fair enough, but Paradox has good reasons for the change and most people do enjoy the new system. It is now more important to focus your provinces. There are still many balance issues, but that has been the case after every single Patch and DLC.
C: The DLC-buyers have an advantage/The game is ruined without the DLC. - The advantage in buying the DLC is relatively minor, unless you specifically only conquer provinces with #9 development. Many people who find the game ruined are also mostly angry at the change in how buildings work.
D: America/Asia/whatever has been hit much harder than other regions. This is working as intended and is the same whether you own the DLC or not. It is completely uneconomical to upgrade large colonial nations. Other than that, it is a matter of balance and I agree that there should be very few if any provinces where you can't construct at least one building.
Furthermore, looking at the steam reviews, most are either describing AI bugs (most of which have been fixed in the hotfix) or about the increase in coring costs.
My own gripes with the development system are currently that there's have to be some balances changes, that they should tie terrain improvement to the development level (draining marshes etc.) and that the unique buildings are an actual loss. The balance will presumably be better in a patch or two as always and they've already said that the unique building bonuses will be back in in some form.