Please note this article is 100% BS. The DLC currently has a Mostly Positive rating on Steam with 87% of the people leaving a positive review.

The people complaining are mostly about stuff like crashes, bad net code and poor fps. This is not a dlc thing, but a base game thing. The pc port simply has some issues, for most people it's totally fine. For others it's unplayable. With the amount of different systems out there, there is always going to be a group of people with issues. I feel like this is a very vocal minority though.