Admittedly it was ~10+ years ago, but my mom had a new G-Wagen that was bought new. It was the worst car I've ever encountered from a reliability* and build-quality** perspective, but damn did it look good. Mercedes USA eventually bought it back under the lemon law where she got a GL450 which was the 2nd worst car from a reliability*** and build-quality** perspective that I've ever encountered. She has a Subaru now and loves it.
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*-somehow put itself in low range on a regular basis then would get stuck in low range requiring a tow to dealer, fix linkage (one of the times), wiring (another one of the times) then 2 or 3 more fixes the other times it happened -3 separate times in heavy rain the wiper motor decided to abruptly die in a billow of smoke -The power windows would go up and down on their own randomly (only when on the highway), sometimes you'd arm the alarm, go to sleep and in the morning all the windows were down -The heated seats turned themselves on randomly
**Of the 10 door handles (5 doors, 1 inner 1 outer) at any given time at least 2 were inoperable as they would "pop" off on the inside to the rest of the release linkage. If the inner and outer of the same door failed together, this rendered that door now a wall. This happened to both on the driver's door at least 2 times where you'd have to climb over the console to get in/out of a ~$100K car. -Buttons regularly came off in your hands when using them; radio, window switches, HVAC, mirror adjustment, power locks, we just kept what fell off in the cupholder for the next trip to the dealer - the buttons had the same issue in the GL450
***When we got the GL450 the air suspension would explode at least 1 corner each winter whenever it finally got cold enough (Long Island, not Alberta), this happened 3 times. Then the seat heater caught on fire and burned through the seat and my mom's jacket, thanks to the guy on the side of the road that ran up with a fire extinguisher and put out that fire when she stopped. Merc's response to that was "that's not supposed to happen"