Yes, it could be. Since it focuses on the gray Hulk, it offers a different view of the character that Hulk fans might enjoy. It can add more depth to their understanding of the Hulk's various forms.
It depends on the fan. Some Hulk fans who are really into exploring all aspects of the character would consider it a must - read. However, if a fan is only interested in the more traditional green Hulk stories, they might not find it as essential. But overall, it has the potential to offer new and exciting content related to the Hulk for many fans.
Definitely. Hulk fans are always interested in different interpretations of the character. The 'Hulk Gray Graphic Novel' gives a chance to explore the less - common gray version of the Hulk. It might have unique story arcs and character developments that are appealing to fans.