1) The weapons and vehicles in multiplayer have been adapted to the new setting. So there is no more armor, but also police cars. Similarly, the mode selection has been heavily customized. Classic modes like Team Deathmatch and Conquest are still to be found, but it has in the previous parts very popular Rush Mode not into the game. This is not one misses but also because it, hostage-taking and robbery new modes are with Hotwire, Blood Money, which fit well into the setting. With Hotwire example is a modified mode of conquest, where instead of flags vehicles are maintained. The new modes provide variety and a lot of fun. How long this lasts, to be seen in the long-term test.
2) are as yet noticed me playing no bugs in the multiplayer. This is compared to the previous parts already a great improvement
Single Player:
Here awaits a actually a familiar campaign that is tailored to the setting. I personally buy the BF series because of the multiplayer, so I put it no assessment priority.
Conclusion:
Overall, an expected with Hardline a thoroughly successful new part of the Battlefield series. The new setting and new modes have given me personally a lot of fun and the game is well-balanced. Whether one of the full price is worth it, but everyone must decide for themselves.