Vigil released today four Darksiders II guide videos on four bosses from the game. If you happen to be struggling, they might actually be helpful.
For the most part, the fights in Darksiders II are more strategic than difficult, similar to Darksiders. Once you figure out how a boss works, you should be able to take it out in no time. Well, unless you're on Nightmare difficulty.
The boss fights can be seen below, narrated by producer Jay Fitzloff. We've arranged them in chronological order, based on when you'll encounter them in-game. Still unsure whether you ought to grab Darksiders II? We really think you ought to. Might want to consider playing the first game, well, first though.
Karkinos - YouTube
Gnashor - YouTube
Archidna - YouTube
Cthulhu Wailing Host - YouTube
If you still need to learn the basics, lead combat designer Ben Cureton has you covered. He narrates a separate "tips" video, focusing on Death's different styles of play.
An Introduction to Death's Combat Style - YouTube