For my first In-n-out experience, it was pretty good!
The place was packed, the wait was total time about 30 minutes. But my God what a delicious burger.
Our group had two different orders, mine came out swimmingly, the other not so much. Their burger was cold and tasted questionable.
The other reason there's a star knocked off is the chaos of the place, there's no real guidance for where to wait to get your order. Some people form lines, others gather around the soda fountains, others find a seat and then can't hear their name being called.
Some consistency would do wonders.