Never will i support Mc donalds AGAIN

I am so tired of complaining. Mc Donalds service really has deteriorated big time. We went on saturday to buy 2x Mega Mac meals with cokes and 1 cheese burger and small cream soda. We are told to wait in the parking lot. A minute later they bring us our burgers, so i ask where is the cooldrinks, with a big huff they go fetch our cooldrinks. When we open up our meals our chips are half full. Am i paying for half a meal. Everytime we go there your staff cant get our order right. They always bring us the wrong order or forget half our order or the food is old. We personally wont support Mc donalds again. Like i said im sick of complaining, but i feel you should know whats going on in your branch. The next day on sunday we stopped again at mc donalds to buy 3 cheese burgers and 2 chicken burgers with 2 cold drinks. We waited half an hour in the drive through. there were 2 cars in front of us, but your staff were so slow it took half an hour just to get to the first window to receive our order. This is unacceptable. Hope things will improve, but i wont come back again.