Wish I had caught this thread when it was active....but it's never too late for another [informed] opinion.
Having owned and driven Isuzu’s for many years, I can shed some light on an otherwise dark subject. In a nutshell, they are great vehicles, eternally under-rated and superbly capable.
Let me also add that there are horror stories about EVERY vehicle; these mean nothing. You can read just as many stories about TLCs and many more about Rovers if you look for them. As for parts; well the same it true for many older vehicles in many countries.
I've owned 3 Isuzu’s with three different engines: 2.6 4cyl petrol, 2.8 GM V6, and my current 2.8TDi. I've travelled across Canada and the US, throughout Baja in summer heat (+40), around Alaska in winter (-20), and now throughout Hokkaido, Japan.
I've also camped in them, driven in off-road rallies, pulled down trees, hauled firewood, towed vehicles, and generally driven the s$@!te outta 'em.
The 1st generation Isuzu Trooper/Bighorn is without a doubt one of the toughest and most capable 4x4s available, with all due respect to CS and others 'in the know'.
Like any vehicles, they have some weaknesses and idiosyncrasies, but overall they are fantastic and will outperform many other similar cars in the worst of conditions.