Oooo eck talk about an open ended question, so many great statements already too! Lemme see what I can add...
First off from the day they were concieved way back when the earth was young they were being designed with a purpose in life, not as a fashion accessory. THey were designed to be all things for all men, to plough the fields, carry sheep, travel large distances, cross all terrains, be repairable by even the most inept mechanic in the middle of nowhere with nothing but bailer twine and grease, run on pretty much any combustable liquid, able to tow heavy loads anywhere (have heard stories of farmers happily towing 20+ tons off the back of a D90 200tdi!!

)...
...The thing to try and do is not list what they can do but try and list what they can't!! The only thing I can think of is not do 35mpg, but then again thats not what they were designed for!
Yes they have problems, yes they cost a bit to repair (esspecially the newer models), but after all is said and done there are still 75% of all Land Rovers ever built still working and driving around this planet and for me thats what makes the marque so good! Longevity and undeniable ability!