I looked at the Patriot before I bought my 05 Grand.
I would tell your friend that he shouldn't spend any more money on it than he has too.
If he wants to hit fire trails the patriot will be fine...but if he is going to sink for then $1,500 into it (new tires, 4 inch lift, spacers, etc.) he should enjoy it for a while then upgrade to something more capable.
The patriot shares the same platform as the Pontiac Vibe and Doge Caliber...
http://en.wikipedia.org/wiki/Pontiac_Vibe
It also depends on what 4WD system he has...
Not the most capable off road rig especially considering the engine.
I am in the same position with my Grand. It is capable but to spend more money on lockers, skids, and sliders is more time, money, and trouble than it's worth. Especially since the Patriot and Grand have IFS.
A budget boost and some Mud Terrain tires should be sufficient for the Patriot. But in the end it wouldn't be worth it to do much more than that.
.