Fun may not be the right word for it. Github certainly never has deserved a description reserved for a world-class roller coaster... I don't think I've ever been "thrilled" by Github, but I've been very satisfied, contented, and sometimes amused by the experience. A positive experience really is useful as it makes getting other developers to comply with the process - something that was really lacking in source control prior to Github (and to a degree git itself).
