We're on our second one now. First was a 12 plate GS TD4, this one is a 63 plate GS SD4. Both were, admittedly, new but have been faultless during our ownership and despite not being a "proper" 4x4 (by which I mean there's no diff lock and low range box), it's incredibly capable off road.
I can't speak for the older models, but we'd certainly have another.
Those who are slating them with comments such as "avoid like the plague" and "will spend most of the their time in the garage" likely have no personal experience of ownership and are just following the herd going on hearsay and parroting what they've read on the internet about bad experiences, because, let's face it, people are more likely to write about a bad experience than a good one.