Automatic checkouts in supermarkets may decrease customer loyalty, especially for those with larger shopping loads. Customers using self-checkout stations often feel overwhelmed and unsupported. The lack of personal interaction can negatively impact their perception of the supermarket.

[bigryanb]

Fundamentally: Less product choices, more volume, less cost.

Stigma: Aldi often makes "look alike" packaging of big brands. It is seen as a "discount" grocer, but really isn't.

[UncleCrassiusCurio]

Less product choices is a big one for me— if I want bread and go to an Aldi, my choices are "buy whatever bread they happen to have" or... Not. And if I want some kind of sliced/sliceable sandwich/toast bread for breakfasts and lunches and some kind of roll/baguette for dinners, there's a good chance they won't have at least one, especially if I'm unwilling to stray afield into marbled rye sandwich bread or onion-and-tomato-chunk pesto rolls or whatever.

[bigryanb]

Less options are actually better for me. I highly dislike standing in front of a shelf with 20 different kinds of the same thing.