For me the Mondeo is all about a perfect blend of comfort, style, performance AND running costs. Forget the purchase price, it's the annual running costs that matter, so I mean fuel, tyres and servicing.
My previous drive was a Peugeot 508 diesel, and I saved a fortune on fuel - but I spent waaaay more than I saved on fuel costs on stupid tyres that were hideously expensive to buy due to their unusual profile size - which the car destroyed in 15K regardless of how often it was re-aligned. each tyre $500!! Peugeot dealer servicing was about double that Ford charge too... and Peugeot brakes $800 for fronts (every 50K) and $650 for rears at 75K.
It's a complicated equation, and you are right to wonder about parts - but I am very happy with the Ford service guarantee which swung me to buy mine in 2016...