Killzone: Shadow Fall is not only a technical showcase for the PlayStation 4, but it also manages to provide a intriguing single player campaign backed up by a strong multiplayer component. However by playing it safe, Guerrilla Games have taken the franchise a few steps back.
I am sure Blizzard will find ways to improve the new systems even more in future patches, but as it stands now they're small issues that hurt the experience just a small bit. In reality, there is nothing to fear, this is a great addition to the game and we are looking forward to seeing how Blizzard will move on with the universe in Diablo III. As for now, I don't know why you're still reading this, go get the expansion and begin your epic loot hunts in Adventure Modes.