So you're saying the Rover V8 is as reliable as the 4.0L I6?
Crucial build problems? Other than the 03 oil pump problem, what are you referring to?
What differences in design? Most of them are carryover. Save... the wheelbearings?
Yes. Having owned both, I can say that the Rover V8 is just as reliable as the Jeep 4.0L I6.
As far as other problems/design changes:
Worn tooling for engine block causing an epidemic of slipped liners/head gasket problems?
Non full-floating front axle design?
Fully-integrated electronics, engine/trans/everything else?
Deletion of CDL linkage in favor of electronic traction control?
Complex and problematic cooling system? Plastic radiator?
Plastic bumpers rather than steel?
More rear overhang less suited to off-road use?
These are the ones I can think of at the moment. However, there are some practical advantages to the D2 as well, such as:
Larger wheel arches and flares which accommodate larger tires with less lift.
More room inside and more comfortable forward facing seven passenger seating.
More refined and comfortable interior all around.
Also, keep in mind that some of the shortcomings of the D2 were fixed with the 2004 model year, which saw the new engine and return of the diff lock, etc.