The polar opposite of "feature-rich"; describes a system which is so devoid of useful features as to be, well, useless.

Feature-barren systems arise when designers believe that powerful features are too dangerous and must be removed, or when marketeers believe that useful features are profitable and should be sold separately, or when a system has been rushed to market before it's finished, or when a system's designers have no imagination whatsoever (or are hamstrung by ultraconservative, unimaginative management), or by some combination of these stultifying factors.