It's a byproduct of a one-size-fits-all-content design for a CMS that all of their output looks like the same drivel. In contrast, if a designer had the opportunity to hand-design each content page distinctly, such a site would look markedly better.
CMSes are not built to produce beautiful design, but to expedite content publication into a designed-once template, so it's no shock that their output typically exemplifies bottom-barrel design.
CMSes are not built to produce beautiful design, but to expedite content publication into a designed-once template, so it's no shock that their output typically exemplifies bottom-barrel design.