"Bhakti yoga teaches who we are, who is the Supreme Being, our relationship, its development and our eternal situation."
If you think about it, major spiritual traditions are rather vague on these essential points. So one could say that b-y is the postgradual type of yoga/spiritual tradition.
The truth is good... (and God), and yes not quack, quick... another translation for the masses could be "the yoga of care", this is the yoga when you care about Krishna...