CRJ 700 FLT CREW FAILED TO MEET A CROSSING RESTRICTION. THE FLYING PLT HEARD ONLY A PORTION OF THE RESTRICTION.

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WHILE INBOUND ON THE ERLIN ARR; ZTL ISSUED US A XING RESTR TO CROSS THE DRAKK INTXN AT FL330. WE HAD BEEN SLOWED TO MACH .76 AND WERE IN A 500 FPM DSCNT OUT OF FL370. I READ BACK THE CLRNC; SET THE ALT ENCODER AND ENTERED FL330 INTO THE FMS AT THE DRAKK WAYPOINT. I STATED 'FL330' FOR THE ENCODER AND AGAIN FOR THE FMS. MY FO WAS THE PF AND WAS INVOLVED IN A CIVIL WAR BOOK. HE VERBALLY ACKNOWLEDGED BOTH INPUTS. I ASSUMED HE WOULD INCREASE HIS RATE OF DSCNT WHEN REACHING THE 3 DEG DSCNT POINT. ONLY THE PF IS DISPLAYED THE FMS SUGGESTED RATE OF DSCNT EVEN THOUGH BOTH INDICATE A 'SNOW FLAKE' AT 3 DEGS. I MADE A MENTAL NOTE TO RECHK HIS FMS RATE. BY THE TIME WE REACHED DRAKK; ZTL TOLD US TO REMAIN AT FL350; WHICH IS WHERE WE ENDED UP. A WHILE LATER WE WERE GIVEN A TA FOR TFC 1000 FT BELOW US. REMAINDER OF FLT WAS UNEVENTFUL. I ALWAYS HAVE A POLICY TO DSND IMMEDIATELY WHEN FLYING AND GIVEN RESTRS AS SMALL AS 1000-2000 FT. THEY SEEM TO SNEAK UP QUICKER. AS THE PNF; I SHOULD INSIST THE OTHER PLT FOLLOW SUCH A POLICY. WE AGREED TO PAY CLOSER ATTN.