International Relations as a discipline and/or field of study

Is it a discipline? Is it a field? Does this distinction matter? Has International Relations failed as an intellectual project as Buzan and Little would suggest? Why or why not? Is there value in a diverse approach to international relations with multiple theories guiding us in our analysis? How and why? Ultimately, how would you evaluate International Relations Theory in terms of its utility for understanding international relations? Please support your answers with examples.