i agree with it - l'm not really interested in humanistic theories, i prefer Freud & psychoanalysis, but if you think about it, i think about it, it's entirely applicable.
think of a poor person on the streets, they're never going to be happy because their basic physical needs are not being met, which is what Maslow claimed causes problems on a psychological level and a personal level.
but then if you think about a rich person, they have their basic needs met so they move higher up the hierarchy and start wanting more meaning to their life, they want a sense of self and perhaps a relationship/family, but a hobo on the street isn't concerned with a sense of self or meaning, they can't even think about that because their basic needs are not being met.
when you think of the theory objectively, it might sound a little idealistic, but i think if you view it in a social context, it's relevancy becomes apparent. But do you agree with it?