I have read some really awful things about the 5th gen 4Runners, but one thing is clear, even 16 years after the 3rd gen started production, people are still raving about what a good truck it is. So read these 3rd gen reviews:
http://www.cars.com/toyota/4runner/1...sumer-reviews/

and now read what people are saying about their brand-spankin' new 5th gen 4Runners:
http://www.edmunds.com/toyota/4runne...r-reviews.html

Usually people's automotive satisfaction drops as cars age and start to show signs of mechanical trouble or general neglect, but in this case, it's the new ones getting the poor reviews.