From Morningstar via Yahoo Finance, the utility/effectiveness of 401(k)'s is being debated:
A common criticism was that even though higher-income workers with financial savvy can manage just fine by investing in a 401(k), lower-income workers and/or those without investment acumen may have difficulty amassing a viable nest egg for retirement. Posters griped about weak investment choices in some plans as well as a lack of guardrails to ensure that participants save enough, don't invade their assets prematurely, and make reasonable investment elections.Read more
The topic definitely is not one where a neat one-answer-fits-all.