Two things I have noticed about people who just volunteer their thoughts that Land Rovers are unreliable, especially online:
1. The vast majority of them have never owned a Land Rover, but are merely just parroting others (who have probably not owned a Land Rover themselves);
2. A lot of them are from Toyota owners who seek to justify their exceedingly boring purchases (or, in the case of the LX 570, exceedingly ugly) that they made in the name of "rElIaBiLiTy."
EDIT: This isn't to say that all Toyotas are boring, but they have distinct drawbacks (and problems) that people just gloss over because of perception.
Look I love Land Rovers but we need to be clear eyed on this issue. Land Rover has consistently been bottom of the barrel in measures or reliability. Yes many of these issues are on extraneous little systems but still they are annoying. I keep all my vehicles long term (10+ years) and the fact of the matter is my Rovers (LR3 HSE and LR4 HSE Lux) cost about double in terms of maintenance to keep on the road in tip top condition vs my other rides (Honda Ridgeline, Volvo V70R, Pontiac G8 GT)