I've never been to a US Aldi, but it's awfully bad here, in any case. I was just surprised that something that crappy wasn't only able to spread abroad, but even to the US, which I thought was already saturated with discounters.
All of which, to make that tangent a little more relevant, made possible by the market
Everyone agrees that its products are bad, and while people who buy there claim it's cheaper, studies have shown that it isn't even cheaper than competitors with a reputation of being costly. This goes to show that the central assumptions of the (perfect) free market model, economic rationality and complete information, don't hold true in the real world.