It doesn't deserve the title Battlefield... it's just a hastily made police series of Skai TV. The gameplay is not interesting at all and it quickly becomes very boring before you even reach 20% of the game. It has some good points like its graphics, but still, it's not worth buying.
BF 3 has nothing to do with BF 4, which clearly doesn't resemble the "bf" Hardline

I disagree with my friend below, but I believe that all the bf3 bf4 and everything else the company has with the same game engine are essentially the same thing, just the newer ones have better graphics. Essentially, if you have bf3, it's not worth it for me to buy either the 4 or this game. I got it for 5 euros on offer from Origin and I don't think I'll be dealing with it much, especially since I haven't liked the company's combat system in bf. I prefer more realistic ones like six siege and red orchestra, not shooting someone for half an hour for them to fall

Big disappointment. Terrible mechanics and gameplay, overall very poorly made. Only the graphics are decent and the multiplayer. The story is original and it would have been a good idea if they paid more attention to it. Overall, Battlefield 3 and Battlefield 4 are superior