I gotta admit that im surprised Bastard!! doesnt have many reviews since its a pretty well known manga. I am a Bastard!! fan so ill try to impartially explain why I find it such a good series. 1st of all, if you are to read Bastard!! you are either an adult or be prepared to see adult content. Because B!! is filled with it. Bastard!! is the story of Dark Schneider, the strongest dark wizard in the world which was sealed 15 years ago and is now brought back to face off against his former allies who are trying to ressurrect a God of destruction calledAnthrax. That's all im writting about the actual story, since it has a lot of twists, and good twists actually, far better than the generic storyline shonen had back in those days. The story starts a bit slow like most shonens, but it picks up and is very well executed. The art is the same, it starts with usual old school shonen manga art, but it ends up as one of the best art you can find in manga. The characters... are quite special, DS is an arrogant bastard just as the title suggests, which actually helps a lot the story since he always makes the situation comical and entertaining. Most of the rest of the chars are also quite defined and quite likeable as well, like Gara, Arshes Nei, Kal Su, etc.
The fights in the serie... they start as your stereotypical shonen as well, but it escalates eventually into godly lvls.
The story however is heavily filled with adult content after it enters the Law of corruption arc, so you gotta be ready to see a few graphic details as I already mentioned, DS is as perverted as the author himself.
The heavy downside is that the series update schedule is irregular due to the authors health condition. However if you can stand that and want a good fighting serie, with funny and well defined characters and an actually good plot, then I definetely recomend Bastard!!
Fun fact: The author is a fan of heavy metal, so the serie is filled with references of said music genre.