RPTR COMPLAINS OF APCH CTLR TECHNIQUE ATC IN RADAR VECTORING FOR SIMULTANEOUS ILS APCH PROC AND THE PROX TO ARR SAME DIRECTION TFC.

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WE WERE BEING VECTORED FOR AN ILS TO 27L AT ORD; SIMULTANEOUS APCHS TO BOTH 27'S WERE IN PROGRESS. THE CTLR WAS VERY BUSY AND I FELT THAT HE WAS HAVING SOME TROUBLE POSITIONING US. WE WERE SLOWED TO 150 KTS; WHICH WAS CLOSE TO OUR MINIMUM APCH SPD; AND ISSUED A VECTOR WHICH PLACED US ON A VERY SHARP INTERCEPT ANGLE. OUR APCH CLRNC WAS GIVEN CLOSE TO THE LOC WITH A REQUEST FOR A 'GOOD RATE OF TURN.' THE FO WAS FLYING AND IN AN EFFORT TO ACCOMMODATE THE CTLR; AND NOT OVERSHOOT THE LOC; HE ROLLED RAPIDLY INTO A 30 DEG BANK. AT THIS POINT; I NOTICED A RATE OF SINK DEVELOP WHICH I IMMEDIATELY BROUGHT TO THE ATTN OF THE FO. HE CORRECTED QUICKLY BUT A MOMENTARY ALT DEV OF SOMEWHAT LESS THAT 200 FT OCCURRED. TFC WAS INTERCEPTING THE PARALLEL LOC AT THIS TIME AND AS OUR INTERCEPT ANGLE WAS QUITE SHARP WE RECEIVED A TA. THIS; OF COURSE; WAS DISTRACTING AND MAY HAVE BEEN A FACTOR IN THE SINK RATE DEVELOPING. I BELIEVE THAT OUR HANDLING BY APCH CTL WAS A SIGNIFICANT FACTOR; AND IN RETROSPECT; I SHOULD HAVE TAKEN THE ACFT IMMEDIATELY RATHER THAN VERBALLY NOTING OUR SINK RATE TO THE FO. OTHER FACTORS INCLUDED IMC CONDITIONS WITH ICING; AND A GUSTY 14 KT WIND AT THE SURFACE. TO MY KNOWLEDGE; NO CONFLICT OCCURRED; HOWEVER; THIS IS AN EXCELLENT EXAMPLE OF THE TYPE OF OVERLOAD SIT WHICH OCCURS REGULARLY AT ORD.