Just to benchmark the discussion a little...
There have histroically been enough APPIC sites (those that proport APA standards but have not gone through the process) for about 80-85% of the students applying. And about 80% of APPIC sites are APA-accredited. Thus, one can assume that about 64-68% of students applying in a given year will end up at an APA-accredited site and 20% will go hungry even after clearing house.
When considering a program, any school that places 65% at APA and 85% or more at APPIC sites would be considered about average on this variable. A school that requires APA-accredited internships should be MUCH higher (90%+), because if not, they are denying graduation to one of their students. This usually holds true at those schools that require it.
Also, consider whether your school is in a destination city (NYC, LA, Chicago, etc.) I would expect these schools to do average or above, because most students move to go to school there and then do a national internship search. Since willingness to relocate is consistently a high variable in determining match rates, this should hold true in those cities.
I would also ask about total match rates and expect it to be near 100%. If students can't match at all, this would signals some questions for me. There is nothing worse than getting to the end of grad school and having to wait another year, with no classes needed and thus little ability to obtain continued aid if needed or being stuck doing more teaching or research when your not progressing.
I consider this a more important variable than EPPP scores in some ways, since this does have an ecologically valid basis.
My 2 cents...