Tomorrow night I'm going to wrap up a short wilderness campaign, and I ran a very well received Wilderness one-shot at Big Bad Con in October. So, yes, it can do Wilderness campaigns at least as well as the next game.
Over Christmas I'm planning to run another wilderness game, this one set in the Fighting Fantasy world of
Titan. Or maybe in
Blacksand if I can motivate myself to dig out the book from my closet.
It really handles low/no prep GMing well; my prefered style.
The XP system works fine as written. There are several alternative systems out there that perhaps work a little bit better, but that's just us fans tweaking a near perfect game.