I never said there was anything wrong with it from a technical perspective (Infact from a technical perspective its excellent, the primary benefit being better fuel economy), but it's not as hassle free as conventional fuel injection. It's an additional failure point, especially on the earlier versions of the petrol direct injection systems - systems like Audi's original FSI, Mitsubishi's original GDi, Ford SCi. The injectors operate under very high pressure, are more complex than standard injection systems and cost more to replace.
The 1.8 SCi was Fords first ever attempt at direct injection on a petrol engined car in the UK.
Heck even BMW are no stranger to reliability issues as a result of direct injection. Numerous issues on IN WARRANTY N53 engined cars (The one thats just replaced the 530d had several replaced under warranty at 1 year old)!
What was your point again? Or did you not have one? Not really seeing the link between Porsche and buying an ex-fleet 6 figure mileage Mondeo, personally?
Bottom line: When buying a cheap car where reliability and longevity is the primary focus, stay away from cars with complex ancillery components if there is a more conventional alternative. In this case, there is ZERO reason to chose a 1.8 SCi over the 2.0 Duratec! None at all!