They were not always so bad. I tried one out when they were just installed (and everyone avoided them); they ran a lot faster, with no upselling or ads. The adware garbage that has long infected the internet has gone right into their kiosks.
Just like how McDs just raised prices endlessly for the past few years, they've also intentionally turned ordering into an adversarial experience.
The biggest issue I have with it is that the touch screen is unresponsive. You press something, and it responds a second later. Completely unforgivable.
On the contrary, I believe they are intentionally laggy to rate-limit the orders, so that people in line can get pissed at the person in front of them rather than the waiter/server taking time to prepare and package the order. Also avoids overwhelming the counter.
The menu is gigantic, it upsells constantly, the screen is buggy, and the food delivery folks don't use the numbers half the time.