People should stop making this a problem a Consoles vs. PC issue. The fact that the PS4 version exists is only relevant in the sense that we can see what the game was supposed to look like, but even in its absence, this is still a debacle.
Even if this game was exclusive for PC, people would be asking for refunds
I see also a lot people defending the pubdevs by saying that people are over blowing the issue. I don't think that's fair. People spend a whole ton of money to get very capable machines and expect games to run to a certain level of performance. PC gamers KNOW very well what their systems are and are not capable of running. If the pubdev is not capable of realizing that this IS the market for PC, they are disrespecting it.
In other words, stop blaming the consumer for the faults of the game maker. The consumer will be always right, so they better get in shape.