For an International airport, RDU is small and easy to get around in. They have construction going on, so that causes some confusion, but its not too bad. Well lit and clearly marked signs, provide good direction for traversing the airport. Rental car locations located on-site, which is really nice if you're short on time. Long term is located off-site, but only about a mile away and they run about every 15 minutes or so. Parking prices are reasonable.
Pros: Traffic signs and parking.
Cons: Inside the airport is crazy like all the rest, but you can blame TSA and the Govt for that.