Your experience at the Philadelphia International Airport will really depend on which airline you're using. I have mainly used Southwest Airlines, which has an entire terminal (E). However, the problem with this is that most of the shopping, food, and services are in the shared terminals of A-D. So once you're through security, you're stuck choosing between Burger King or the airport pub. With the arrival of SWA, Philadelphia has been swamped. They could really use some more room for this terminal, or at least the baggage claim.
Overall, it's a fast, efficient, and clean airport. I just wish they didn't quarantine the SWA passengers into Terminal E.