So a professor of mine and another student were having a discussion about the PGRE the other day. While it does seem to be of the overall opinion that it is only good for determining how well a student can take the PGRE and not really how good they are at being a physics student, I've come to a different conclusion. I've noticed that the people in my department who can't do physics worth a damn and who should have picked a different major a long time ago are the same ones who can't score beyond 20th percentile even while they're doing their masters degree at the time of taking the test. For example, one of these students I posed a question to: If you drop a ball off of a building and simultaneously let another ball roll off a ramp connected to the building at the same height, what would reach the ground first? They couldn't figure it out... and these are people who want to go get their PHD and teach this stuff. So most people say you shouldn't judge someone based on how well or poorly they do on the PGRE. My contention is that if you can't do well on it, you have no business trying to get into a PHD program. Your thoughts and opinions?