The Ford is fantastic value for money. Sit in the cabin and you'll soon see where a lot of money has been saved. It feels really cheap, too cheap.
None of the German cars score well in reliability surveys. You sometimes need to read these surveys as they use really stage methods of gaining their results.
Then again most surveys are only done with a tiny percentage of customers. It's so small you can get very twisted results. If you've bought a premium brand car, you expect a bit more. When it falls short of that, you're far more likely to complain.
I didn't realise that the M235i had many issues. I've not really read too much to worry about other than the auto box.
Having already read about lots of Mustang build quality issues, reliability issue and one bursting into flames, I'm confident that the M235i will trounce the Mustang in longterm reliability.