After the years of remodeling, PDX is finally a place to be proud of. It's easy to navigate, easy to get to and from, and there is plenty to keep you occupied while you're here (good food, not the typical airport crap).
The only drawback would be connecting between flights on the opposite side of the terminal, because there is no secure passageway (you have to leave and re-enter security). But since Portland isn't a hub, this is the exception.
Pros: Easy to navigate, Very spacious, Lots of good food