Temple does make a better showing than Pitt in 'objective' numbers, and has done so for several years, which explains the higher Princeton Review ratings. However, 40% of the USNWR ranking is 'reputation' among law school deans, judges and big firm hiring partners. Pitt still does better than Temple in this subjective factor.
I doubt that many of the people who fill out reputation questionaires are aware of the objective stats of all ABA acredited schools. Thus, Temple's USN rank suffers accordingly.
As for placement, those stats can be doctored, although it would not surprise me if in fact Pitt did have better placement. Pitt pretty much owns Pittsburgh, whereas Temple shares the Philadelphia market with Rutgers-Camden, Villanova, and the minority of Penn graduates who choose not to go to NYC.