Anecdote 1: Miele has a very good reputation. They also cost three times as much as the volume sellers and have a much lower market share. Sorry, no evidence of that claim. The closest is an article [1] claiming they produce 850.000 units per year.
Anecdote 2: I just replaced a cheap ($200) oven from Ikea (made by Whirlpool). Most likely the heater had broken. Inspection, parts and repair would probably cost the same as a new one. It had lasted 5 years, just past the warranty. We bought a new one, same model. It's simply too cheap to repair.
My conclusion: Lousy quality is our own fault - we do have options.
[1] http://www.telegraph.co.uk/finance/newsbysector/retailandcon...