I've been in a Lidl once. I found it an entirely and thoroughly depressing experience. Things not unpacked. Grim lighting. People shuffling around looking like they'd been sleeping rough, counting out pennies to see if they could afford a tin of dog food masquerading as meat fit for human consumption. It seemed exactly as I thought it would be - and I was surprised at how cheap and nasty it was, given the amount of advertising they do to make it look all shiny and nice.
I just found it a horrible place to be. I also thought the quality dubious, and particularly of the 'fresh' produce, which frankly looked crap.