Payday 2 is a team-based first person shooter and strategy game where players must perform all sorts of criminal activities (such as robbing banks and robbing stores) in order to gain loot.
Con Stat boosting microtransactions
With Crimefest 2015, the developer (Overkill) decided it would be a good idea to add stat boosting gun skins which can only be acquired through use of real money. This makes for a pay-to-win scenario where people who use real money can gain advantage over non-paying players.
Con Some DLC requires owning other games
Examples of game-tied DLC (paid downloadable content) are masks, weapons, a skill set and locked achievements of games such as Hotline Miami Deluxe Edition and Speedrunners. This means you can't fully unlock all of the content available for Payday 2 unless you purchase these games as well.