ATC QUERIED A CREW ABOUT A CROSSING RESTRICTION COMPLIANCE WHICH THE CAPT AFFIRMED THEY WOULD MAKE. THEY MISSED THE RESTRICTION AND WERE VECTORED.

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WHILE ENRTE ON THE ARR INTO ZZZ; WE HAD A MESSAGE ON ACARS TO CONTACT ZZZ. THE FO CONTACTED ZZZ OPS AND WAS INFORMED OF AN ACFT SWAP WITH THAT ACFT ALONG WITH SEVERAL GATE CHANGES. THERE WAS CONFUSION ON THE OPS FREQ WHICH CAUSED A LONGER THAN NORMAL TIME FRAME FOR THIS OCCURRENCE. WHEN I RETURNED TO ATC COM I INFORMED THE CAPT OF WHAT WAS GOING ON AND THAT I WAS BACK WITH HIM. AT THIS POINT ATC QUESTIONED US IF WE WERE GOING TO MAKE THE FIX AT 9000 FT. HAVING JUST COME BACK TO THE SCENE; I ASKED THE CAPT IF WE COULD; IN WHICH HE SAID; 'YES.' I RELAYED THAT TO ATC. AT THIS POINT I NOTICED WE HAD SPD BRAKES EXTENDED AT THE FASTEST RATE OF DSCNT THE ACFT WOULD BE ABLE TO PERFORM. ATC THEN ASKED AGAIN IF WE WERE GOING TO MAKE THE XING. THE CAPT TOLD ME TO TELL THEM YES AND THAT IT SHOULDN'T BE A PROB. MY QUICK TAKE ON THE SCENARIO WAS THAT WE WOULDN'T; BUT UNDERSTOOD THAT THE CAPT HAD MUCH MORE EXPERIENCE WITH THE ACFT AND TRUSTED HIS CALCULATION OVER MINE. AT THAT POINT ATC CHANGED OUR FREQ TO APCH AND THERE WAS A FREQ BLOCK WHEN I WAS TRYING TO RELAY TO THE CTR CTLR. I FINALLY JUST CHANGED FREQS ON MY OWN AND CHKED IN WITH APCH. AT THIS POINT I NOTICED OUR MISS BY APPROX 1500 FT AND WERE 320 KTS GOING THROUGH 10000 FT FOR THE LEVELOFF AT 9000 FT. APCH INSTRUCTED US TO MAINTAIN 250 KTS AND A MIN LATER GAVE US A RADAR VECTOR. THE CAPT QUERIED ATC ABOUT THE EVENT AND ATC RESPONDED THAT WE WERE HIGH ON THE XING AND APPEARED TO BE FAST. NO OTHER ACFT SEEMED CONFLICTED WITH OUR EVENT. THE ENTIRE EVENT HAPPENED EXTREMELY QUICK WITH LITTLE TIME FOR CREW MEMBER INTERACTION COUPLED WITH THE COM CHANGES AND FREQ CHANGE. ANOTHER THREAT WAS CRM BREAKDOWN BTWN US; COUPLED WITH AN ARTIFICIAL PRESSURE TO MAKE THE XING RESTR CAUSING 'TUNNEL VISION' AND LOWERING OUR SITUATIONAL AWARENESS. BETTER CRM AND SITUATIONAL AWARENESS ESPECIALLY WITH 1 PLT DOING OTHER DUTIES NEEDED TO OCCUR. I; AS THE FO SHOULD HAVE SPOKEN UP MORE ON MY CALCULATION FOR DSCNT INSTEAD OF TRUSTING MY CAPT'S COMPLETELY.