I don't know that I would agree with that, what's your metric for standards which sets Aldi above every other chain in the USA?
Aldi's great, don't get me wrong, I love several of their business decisions such as the quarter for a cart, allowing customers to take excess boxes to reduce clean up, and they let their cashiers sit. That said, they are an overstock/discount/outlet style store and don't reliably have the exact product you might want. If you're looking for good prices they will generally have something you want, but it might be a different brand or style. In my mind it's like a Ross, Marshals, or TJ Maxx but for groceries. Another plus is that Aldi has interesting items not typically seen at other stores such as German or European items.
Other people in these comments mentioned that their Aldi looks nice while having good prices, but the 4 Aldi's near me look like they are still in the 1990s. Other USA brands more reliably have staple items but might be more expensive. Publix, Harris Teeter, Kroger, Whole Foods, and Fresh Market are definitely nicer than Aldi in quality. Food Lion and similar stores are comparable quality and maybe just slightly more expensive, and then the Aldi clones are there too (Lidl, Trader Joes, etc).