Thanks for your opinion.
Like all Rover forums, we get our share of questions from people who see a $4000 Disco or Range Rover on Craigslist, and think "Cool! Cheap truck!" I certainly did. I went and looked at over 15 Disco Is in my area, and each and every one had one or more little problems here or there that the previous owner didn't fix. Some of them had major problems the owners were ignoring until they died on the side of the road. Some would have been less than $100 (parts via eBay) and some man hours to fix, some would have been many thousands. Again, we're talking about a ~15 year old vehicle, so I don't expect them to be pristine in my environment. I do expect doors and windows to open/close, doors to lock, transmissions to shift, engines to idle... These were all street-driven, soccer mom vehicles, many maintained by the dealer for a good portion of their lives (until probably the 75-100K point). At some point, the owners just decided to let some stuff slide for financial or whatever reasons. Happens to just about every car at some point.
What I walked away from that experience with was a perspective that while a Disco I is one of my dream vehicles, finding one that met my needs and financial goals would have been problematic- if not impossible. I'm not willing to dump the same amount of money into a Disco as I am my Series, because the long-term attachment isn't as strong. The Disco would likely serve as a daily driver and family camping rig, which is a role currently served by a more economical (MPG, maintenance) vehicle that is historically more reliable.
Anyway, just providing my view on them. It is my strong belief that anyone who says Land Rover makes the most reliable vehicles out there for expedition travel has been drinking the green KoolAid for too long. Capable? Yes (big Yes). Reliable? I guess that would depend on your definition of reliable. The weight one puts on capability, economy, reliability, or image (a big selling point) determines if a Rover is right for them.
...but I don't own a Disco, so I wouldn't know.