It looks like you were expecting them (LQ) to go above and beyond, which is understandable but I think you were just setting yourself for a disappointment. Loaners are usually booked like a month in advance and like someone posted above the car should be dropped off at the dealership and you should be going about your day. What if the dealer would have to order a part and the car will sit there for 5 days, will you stick around and wait? Of course not. Btw, that happened to me on the E class, the car was not even a month old and the seal on the door was peeling off, I dropped the car off and got a call that the piece of rubber has to be ordered from Germany, car was there for 4 days. That's how it is with the dealers, it's usually never the best case scenario.