2002s are frequently shunned, at least on this board, for having many first year problems, but the experience varies. This perception may in part contribute to the low value of '02s (hence the good deal).
Mine, a fully loaded 02 Limited, bought new, now at 101K miles is like brand new with very few repairs to date.
Biggest trouble area is the transmission, very expensive to replace if not maintained by the prior owner. Some have the rear end whine that results in an eventual failure (mine has whined since new and still runs fine), and some have seen broken rear springs (not the most expensive repair, but hard to accept why this happens). Additionally, some have had funky electronics. Also, many ahve the bubbling pain on teh aluminum hood, and the cracked rear liftgate panel.
Try to get the service history on the one you are looking at. $6700 seems like a good price for a low mileage, well-maintained one. I would easily pay that for mine in its condition. Also, try to determine if it has been used for extensive tough towing duty (not great for these trannies).