They added micro-transactions on top of the already egregious amounts of DLC.
Basically Crimefest 2015 is happening, and they promised all updates would be free. And I guess the update is free, but to actually enjoy it you need to shell out $2,50 per weapon.
The micro-transactions are in the form of "weapon skins" like in CS:GO, except these ones also give stat boosts. On top of that they've nerfed most weapons (but buffed pistols to hilariously OP levels), to encourage people to offset the difference by buying stat-boosting skins.
Additionally the development team is falling apart. A lot of the employees are leaving in droves. The vice-president (brother of the CEO, too) of Starbreeze, Ulf Andersson, had a falling out due to the business practices, and he's now started his own company. Naturally Overkill couldn't help but mock Ulf by portraying Wolf (the ingame character that's based on Ulf) in a negative way.
It appears there's a bit of corruption in the company too, just read this.
The negative reviews are slowly but surely taking over the 100k outdated positive reviews, as well. Metacritic ratings went from 7.9 to 5.0. Sales figures are dropping.