This is actually quite funny if we compare the business models.
1. Release unfinished game after promising a full retail version and then use the customer money to patch it to acceptable state, like was done with this game.
2. Tell people to pay for beta and give a promise to release the full game. Good examples are Minecraft and Mount & Blade.
As you see in both approaches it is the same thing: customers pay for an unfinished product and thus funding the company to finish it. However in the first approach you have angry customers wanting their money back, in the second approach customers are loving supporting fans.
What should Kerberox and Paradox done in this case? Postpone the entire game until it is finished, but give the pre-order customers a "privilege" to an early "beta" access (which is the current released game). That psychological approach would make us feel privileged for "exclusive access", that we wouldn't even complain about the lack of features, but instead give feedback on many problems. Everyone is happy, developers get funding. It's a win-win situation.
Damn, I should apply for the marketing department at Paradox...
This. Good god, why don't you do this? Everyone would have been supportive instead of understandably angry at the current mess.