I test drove a Freelander when they first came out, nice little car, but hardly equipped for serious off-roading. You can take anything with 4wd or AWD down a dirt road and even some simple cross country stuff, but if off-roading was my primary reason for the purchase, there are many, many other more capable rigs. Not that there is anything wrong with them, its just they appear to have been designed as a small family suv, which is why they sold well in the UK.
The Liberty has sold a lot, but not to a lot of serious off-road people. True, there are some neat after-market shit for them, but the truth is that few (%) make it on a decent trail.
Freelander vs the Wrangler is just silly. The (did someone call it a "darby"?) is designed to be a little sporty suv, the Wrangler is used by a lot of college kids for a runabout, but is the foundation for a serious off-road vehicle. They have very little in common.
Disco I or II vs a Freelander, well my DII never sees a serious trail, only becasue my wife would kill me if I scratched or dented it. I got the Rubi for serious playing. If I didn't have it, it would be a built up XJ. Both are cheap to modify and a hell of a lot easier and cheaper to fix than my Discovery. The Discovery was purchased to lug 2 adults, 2 kids, a ton of crap and the ocassional dog up and down Big Bear in the winter.