Haven't heard to much bad about the 2006 and onwards bravo and rangers / couriers but from 98-06 the bravo/courier 2.5 turbo diesel has a few problems
They chew glow plugs
Prone to cracking the head
Generally just run a bit too hot
The 2wd box is weak as shit an generally blows 5th gear
And the 4wd blow diffs fairly easily
My 2 c I'm not a fan of the great walls although I've herd good and bad but i wouldn't tell someone not to buy one if they wanted one