I think it is. The plot has depth, the action scenes are exciting, and it has a good mix of humor and drama. However, it might not be for everyone depending on personal preferences.
The Soul Eater manga did end. It wrapped up its plotlines and gave a satisfying conclusion to the fans. However, opinions on the ending may vary among readers.
Yes, God Eater has a manga. It provides a different way to experience the God Eater universe, with unique art and storytelling. Many fans enjoy both the manga and the other related media.