Original post was titled "Coffee machines reliability chart", but the image says that they're in the "espresso machine category".
The biggest swiss online seller makes charts for warranty claims. Basically: how many warranty claims does each brand have? This chart only shows the most popular brands of coffee machines sold on the site, but I still find it interesting.
The site is called digitec.ch and I love it. There are also price history charts, repaired second hand devices, user ratings, a question section for each product, external vendors who sometimes have lower prices than digitec themselves and a very good customer service. Never had any problems with them.