Although I largely agree, there is little actual experimental support for Maslow's theory. He mostly just made it up. See http://lesswrong.com/lw/2j/schools_proliferating_without_evidence/ . See also eg.:

"The uncritical acceptance of Maslow's need hierarchy theory despite the lack of empirical evidence is discussed and the need for a review of recent empirical evidence is emphasized. A review of ten factor-analytic and three ranking studies testing Maslow's theory showed only partial support for the concept of need hierarchy. A large number of cross-sectional studies showed no clear evidence for Maslow's deprivation/domination proposition except with regard to self-actualization. Longitudinal studies testing Maslow's gratification/activation proposition showed no support, and the limited support received from cross-sectional studies is questionable due to numerous measurement problems."

from "Maslow reconsidered: A review of research on the need hierarchy theory", by Wahba and Bridwell.