WAKE TURB ENCOUNTER.

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WE WERE OPERATING FLT FROM TAMPA TO MIAMI. WE WERE VECTORED TO JOIN THE RWY 09R LOC AT 3000 FT ABOUT 12 MI OUT. OUR TFC TO FOLLOW WAS A B727 3-4 MI AHEAD AT OUR 2 O'CLOCK POS WHO WAS ON A VECTOR TO JOIN. ATC POINTED HIM OUT BY RELATIVE POS AND 'ABOVE.' OUR TCASII SHOWED THE B- 727 TO BE LEVEL AT 7000 FT. THE B727 OVERSHOT THE LOC AND DID NOT BEGIN ITS DSCNT UNTIL FINALLY ESTABLISHED AND ABOUT 7 MI OUT. WE HAD NOT HEARD ATC GIVE HIM A DSCNT CLRNC; SO I DON'T KNOW WHY HE WAITED SO LONG TO DSND. THE B727 WAS OPERATED BY A DOMESTIC CARRIER. TWR HAD US 'SLOW TO 150 KIAS AND MAINTAIN VISUAL; CAUTION WAKE TURB.' NEEDLESS TO SAY WE RAN RIGHT INTO IT; AND WHEN I RPTED IT TO THE TWR HE SAID 'THAT'S WHY I HAD YOU SLOW DOWN.' HE APPARENTLY DOES NOT VISUALIZE 3 DIMENSIONALLY. I STRONGLY RECOMMEND NO LARGE OR HVY ACFT BE ALLOWED TO JOIN AN APCH WHEN SUBSTANTIALLY (OVER 1000-1500 FT) ABOVE THE FOLLOWING ACFT. CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING: RPTR IS ADAMANT THAT SOMETHING BE DONE ABOUT DSNDING LARGER JET ACFT DOWN THROUGH THEIR LNDG PROFILE AND LEAVING A WAKE THAT CANNOT BE AVOIDED. ALTHOUGH HIS ACFT DID NOT LOSE ANY ALT; IT WAS OUT OF CTL FOR ABOUT 4 SECONDS. BOTH PLTS HAD HANDS ON THE CTL TO TRY TO LEVEL WINGS. BANK WENT FROM 70 DEGS TO LESSER AMOUNTS TO THE L AND R. FLC HAD GOOD VISUAL CONDITIONS AND FELT THEY WOULD ENCOUNTER THE WAKE; BUT NEVER THOUGHT ABOUT OR CONSIDERED DEVIATING TO THE SIDE TO AVOID WAKE. RPTR WANTS SOMETHING DONE THAT CHANGES LARGE JETS FROM DSNDING THROUGH THEIR ALT.