I have a 2 year old house with a full Miele appliance package including a 48 inch range, another separate full size oven, dishwasher, 36 inch refrigerator, 36 inch freezer, built in coffee maker and microwave. Almost every one of these appliances has issues of one sort or another.
Starting with the range, 2 of the 6 gas burners shoot out long fingerlike flames rather than a nice ring of fire like you'd expect. 3 of the six won't light automatically with the built in igniter so I have to use a lighter. On the 2 ovens in that range, they use a touchscreen apparently borrowed from the 1980s that refuses human input 90% of the time. So far the griddle is the only thing that works as expected on the range.
Moving on to the dishwasher, it has so far worked ok, but it's infuriating to use on a daily basis. Why? Because someone at Miele thought it would be cute to have the display show the Miele logo for 20 seconds or so when you turn on the appliance, during which time you cannot do anything other than stare at the logo. About every 10th time it doesn't show the logo and you can just select the mode and start the dishwasher. The rest of the time, you have to sit and wait for it to go away. And all this while already having a permanently embossed logo stamped into the stainless steel 4 inches away on the same panel.
On the refrigerator, the biggest issue is the plastic clips that are used on the drawers. They fall out constantly making the drawer unusable until you empty it out, take it all apart, retrieve the fallen clip and reassemble it so you can open and close the drawer normally.
The freezer is ok except for the ice maker, which is poorly designed and placed making it not only a pain to access the ice, but also making half the ice in the bin useless. We use it every day yet in just a 2 or 3 days time, all the ice in the bottom is fused together in what looks like snow cone ice.
The coffee machine makes good coffee, but it is constantly calling for me to empty the drip tray or the waste bin, even though they are already empty. I sometimes have to remove and reinsert either one 3 or 4 times to get the machine to allow me to continue to make a cup of coffee.
The microwave with its knobs rather than a typical set of soft buttons feels like something from the 70s, but otherwise works ok.
Overall, everything is poorly engineered and cheaply made, which is pretty shocking from the Germans.