Crusader Kings 2 is horrible without DLCs. And I don't mean cosmetic DLCs, but the game content DLCs.
What is even worse, on the course of upgrading the game, people who don't own any DLCs have even lesser game than before!
I wonder how that would hold up in court - somebody bought CK2 and was playing the Byzantine empire, his favourite nation. But when the Legacy of Rome DLC came out, he can't play as Byzantine empire AT ALL, unless he buys an expansion.
Over a course of time, they disabled some options for him and require him to pay for them.
CK2 without major DLCs is barebones.
And what about Paradox classics on GOG? :P