Tyre choice is crucial ! I run BFG Mud Terrain on my 90 Landy as it's 80% off road, they're still good for 25000 miles but I tend to change them early when the treads down to @4mm as they lose the ability to grip! ML has Avon Ranger 275/75 17 which are nice & quiet but still got enough grip for the odd beach launch as it's @ 0.5 % off road.
Still think that the old G Wagon Merc was the most effective 4wd with it's ability to lock all the diffs so that all four wheels pulled. With the right tyres they were unstoppable.
Some drivers shouldn't be off road anyway, see it most weeks around here !!