IMO, the crap bikes Walmart sells are much better than the crap bikes box stores when I was growing up (late 1960s). Walmart sells bikes at very low prices. At those price points, manufacturers can't build much into them. And at least in my market, buyers could do a lot BETTER buying USED. People profess a commitment to being "green", but many continue to buy new. So much lightly used stuff out there.
To me, there is a bigger issue with who assembles the bike.