I can't think that there's anything that I wouldn't touch. We do our weekly shop there as it's our local supermarket and it's perfectly serviceable as that.
Our local aldi has fantastic produce - the nearest aada is atrocious (stuff is actually moulding on the shelves!). The dates aren't always amazing, buy we've just eaten strawberries that were bought on Monday with a date of a few days ago and they were perfect.
Special mention for the dairly cottage cheese, which apparently isn't an aldi-specific product. But it's the only place I've found it.
We love their
rectangle chicken and mango pizza,
chocolate-covered frozen fruit,
chocolate-covered coconut clusters,
freeze fried fruit.
The moser roth chocolate is good.
Fresh pizzas - in particular, the ham, mozzarella and mushroom - are nice.
I like their ridged lights - potatoes, oil and salt.
Deli meats have always been good (same in Lidl).
Their sourdough/protein breads are decent if you can't get Jason's.
I personally prefer green giant tinned sweetcorn to all other brands, but the aldi one is no better/worse than other supermarket offerings.