A HVY JET OVERSHOT THE LOC WHILE PARALLEL APCHS WERE IN PROGRESS; CAUSING THE RPTR'S ACFT TO TAKE EVASIVE ACTION.

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WHILE BEING VECTORED FOR APCH TO RWY 9L AT MIA ATC ALSO VECTORED A HVY JET WITHIN CLOSE PROX TO OUR ACFT REQUIRING US TO MAKE A HASTY DEV FROM OUR CLRED FLT PATH TO AVOID A COLLISION. WE WERE ON A STEADY HDG AT OUR ASSIGNED ALT AND WERE MONITORING THE OTHER TFC ON OUR TCASII. THE HVY JET REQUIRED MORE ROOM FOR HIS TURN THAN ATC HAD PLANNED. THE PROB IS MIA ATC OR THE PROCS THEY USE. THIS HAS HAPPENED BEFORE TO MYSELF AND OTHER PLT WITH OUR COMPANY NUMEROUS TIMES AT MIA BUT NEVER AS CLOSE TO A MIDAIR. MIA ATC IS DANGEROUS. THE ACCOUNTS ARE TOO NUMEROUS TO MENTION. THEY CONFUSE CALL SIGNS REGULARLY; MISDIRECT TFC; CONSTANTLY WANT YOU TO CALL TFC VISUALLY SO THEY CAN PASS THE RESPONSIBILITY TO THE FLC AND CONSISTENTLY DO NOT FOLLOW SPACING REQUIREMENTS BEHIND HVY JETS. EVERYONE MAKES MISTAKES AND CTLRS ARE A FINE BUNCH OF GUYS BUT FOR SOME REASON THERE ARE MORE MISTAKES AT MIA THAN MOST ARPTS. I DON'T KNOW WHAT THE ANSWER IS BUT I WOULD BET IT WOULD BE WITH THE PROCS ATC MUST FOLLOW IN THE MIA AREA.