Depending on age, it will either be Ford engine or Jaguar Ingenium. The Ford one is a little, err, agricultural, but generally very reliable. The Ingenium diesel is very refined but has a couple of very well known issues, particularly around chains, allegedly less reliable than a K series HG. That said, her car is Ingenium diesel, over 150k miles, original chains, and properly reliable aside from an occasional limp mode where I can't work out what is going on (P006A MAP/MAF correlation)
Rest of the car will depend on its previous life (as will the engine in reality), both service and usage - being a pretty capable 4x4, it might have spend its life towing horseboxes out of muddy fields, or reversing speedboats into the sea. Or it might have just taken the kids to school.
As a car, most Disco sports seem nice to ride in and drive, better than the Freelander II, which itself is miles better than the original Freelander...