It's a sport if you realize that the sport is also a competition in drug utilization. Who has the best drug coctail is a factor if you want to compete at high level.
And if you accept that it is based on an objective criteria BUT a subjective selection of that criteria i.e. what criteria outweighs what. Like Mass vs Defenition vs propotions/balance vs presentation. That is subjectively based. Who can say what is more important than the other and who can judge that objectively unless you have some sort of point system for each of that criteria, then maybe you could work something objectively based out of the judging aspect.