The UI isn’t just terrible, it’s hostile to the user. The rare times I am forced to interact with it I feel like I’m using software that was meant for some other purpose. I’ve worked in the industry for 25 years, I’ve never come across worse UI.
My favourite bit of the SAP UI is whenever you scroll a listbox, it goes back to the server to load the rest of the list. It only has data for the exact 5 items it's showing; the other 1 above or 3 below each need a server hit. And it forgets the data it loaded before.
It isn't use for you as a user, it is meant to run your company. You are not the user, you are the one feeding data into the system. And that is actually perfectly fine in case of ERP systems.
