I've always said the following about law school grades:
There are usually 3-5 people in a section that will compete for A's/Book Awards EVERY SINGLE TIME. Those people have a rare combination of genius, clarity with regards to how to take a law school exam, and a phenomenal work ethic.
Then there are those of us who may get an A here and there, but we are generally more at the whim of the curve. These people hover just above the median with regards to individual grades, but occasionally break through and grab an A, or slip up and get a grade at or below median. These people really only make up 20-30% of a section.
Then there is everyone else. These people are the majority of the section. It is very unlikely that they'll ever get an A range grade in their law school career. Median grades are the norm for some; they're simply average. The rest may get a median grade here or there, but they're generally below the curve. They'll work extra hard after fall semester, review their exam, etc... but it's very unlikely to pay off.
That's why it's a good thing to get a couple A range grades and a couple below median grades that average you out to a median cumulative gpa. You get to decide which group you're in, and you have at least some indication that you can perform.
(These are just my observations from my own law school experiences, and from watching and talking to my classmates and upperclassmen)