A B737-300 FLC GETS DISTR DURING A VISUAL APCH AND OVERSHOOTS THEIR ASSIGNED ALT. CREW CRITICIZED THE BOI APCH CTLR FOR HIS EXCESSIVE VECTORING OF THEM BEHIND A SLOWER ACFT.

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FLT FROM RNO-BOI. WE WERE HELD AT OUR CRUISE ALT OF FL330 UNTIL 75 NM FROM BOI BY ATC; LEAVING US EXTREMELY HIGH FOR THE ARPT WHEN HANDED OFF TO BOI APCH. WITHIN 10 MI OF THE ARPT; WE WERE APCHING NORMAL PROFILE FOR THE RWY AND ANTICIPATING A VISUAL APCH CLRNC WHEN BOI APCH ADVISED US THAT WE WERE FOLLOWING A SINGLE ENG PILATIUS TURBOPROP ON 15 MI FINAL. WE WERE ON A VECTOR TOWARDS THE ARPT AND TOLD TO DSND AND MAINTAIN 6500 FT. AT THIS POINT; THE CAPT AND I BECAME CONCERNED THAT WE WERE VERY CLOSE TO THE ARPT TO MAKE A VISUAL APCH WITH A 6500 FT ALT RESTR. ADDITIONALLY; IT DIDN'T MAKE SENSE TO US THAT THE CTLR WOULD SEQUENCE A FASTER AIRPLANE THAT WAS CLOSER TO THE ARPT BEHIND A SLOWER ACFT. WE ALSO WONDERED ALOUD WHY HE COULDN'T CLR US BOTH FOR A VISUAL APCH TO SEPARATE PARALLEL RWYS 28L&R SINCE BOTH ACFT HAD EACH OTHER AND THE ARPT IN SIGHT. AS THESE CONVERSATIONS WERE GOING ON; THE CTLR WAS ISSUING CONTINUOUS SPD AND HDG CHANGES TO US IN ORDER TO PUT US BEHIND THE PILATIUS. IN THE FACE OF A CONFOUNDING SIT AND MY DESIRE TO KEEP THE ACFT IN A MANAGEABLE DSCNT PROFILE; WE BOTH LOST TRACK OF OUR 6500 FT ALT ASSIGNMENT UNTIL WE HAD DSNDED 600 FT BELOW IT. BECAUSE OF THE CONTINUOUS RADIO CHATTER; NEITHER OF US REMEMBER HEARING THE 1000 FT WARNING BELL OR THE 300 FT OVERSHOOT BELL. WE BOTH SAW THE OVERSHOOT AT THE SAME TIME AND RETURNED TO 6500 FT. THE CTLR SAW THE OVERSHOOT AND REMINDED US OF OUR ALT ASSIGNMENT. THIS IS A COMMON PROB AT MANY THE ARPTS WE SERVE. THE CTLRS ARE TRYING TO FLY OUR AIRPLANES ALL THE WAY TO THE GND WITH LITTLE APPARENT UNDERSTANDING OF THE ENERGY MGMNT INVOLVED ALONG WITH THE APCH PROFILES THE COMPANY AND THE FAA TRAIN US TO USE. IT IS AN UNCOMFORTABLE FEELING TO BE HIGH AND FAST FOR AN ARPT AND NOT KNOW IF THE CTLR IS GOING TO EXTEND YOU OUT OR DUMP YOU IN CLOSE. SOME COM WOULD HELP; OR BETTER YET; WHEN WE HAVE TFC AT THE ARPT; CLR US FOR A VISUAL APCH. WE CAN MAINTAIN A BETTER PROFILE AND SEPARATION WITH WHAT WE SEE THAN WHAT THEY SEE. QUIT VECTORING US TO DEATH!