A C560 CPR FLC ENCOUNTERS AN APPARENT COORD PROB BTWN IAD AND BWI.

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WE WERE CLRED TO SUSII. WE WERE THEN HANDED OFF TO BWI APCH (WHO DIDN'T SEEM TO KNOW WHAT APCH WE WERE REQUESTING) ABOUT 8 MI OUTSIDE OF SUSII. SHE INFORMED US THAT THERE WOULD BE A DELAY BECAUSE THEY WERE WAITING FOR A DEP OFF FDK. WE WENT OVER TOP FDK AT I BELIEVE 3000 FT AND AT THAT TIME SHE CLRED US FOR THE APCH. I TOLD HER WE WERE TOO CLOSE TO THE ARPT AND NEEDED A BOX PATTERN VECTORS AROUND FOR SUSII WAYPOINT. AFTER VECTORING US AROUND SHE THEN 'CLRED US FOR THE GPS RWY 5 APCH AT FDK; MAINTAIN 3000 FT UNTIL SUSII INBOUND.' AFTER WE READ THE CLRNC BACK SHE ASKED US TO CALL ATC AND GAVE US THE PHONE NUMBER. WE SHOT THE APCH FROM ABOUT 5 MI OUTSIDE OF SUSII AND MISSED -- GOT VECTORS FOR THE ILS RWY 23 AND GOT IN OK THAT WAY. IT APPEARS THAT WE HAD THE WX GO DOWN SIGNIFICANTLY WHILE WE WERE BEING VECTORED AROUND. IT ALSO APPEARS THAT SHE IS NOT ABLE TO PROVIDE VECTORS TO FINAL APCH COURSE. AFTER AN UNEVENTFUL TRIP HOME TO GSO; I CALLED BWI APCH (EVEN THOUGH I WASN'T THE CAPT ON THE TRIP AND I WASN'T THE PF). THE SUPVR (WHO WAS VERY NICE AND PROFESSIONAL) ASKED ME FOR MY OPINION ABOUT THIS MATTER. SINCE DULLES APCH APPARENTLY OWNS THE AIRSPACE W OF MRB VOR; THEN WHY DID THEY CLR US DIRECT TO SUSII KNOWING FULL WELL WE WANTED TO DO THE GPS RWY 5 APCH? AND NEVER TOLD BWI APCH OF OUR INTENTIONS? IF BWI APCH CAN'T VECTOR US ONTO FINAL APCH COURSE; THEN WHY DIDN'T DULLES APCH DO SO? OR BETTER YET; WHY DIDN'T DULLES APCH MAKE US START THE APCH FROM THE IAF WHICH IS MRB SO THEY COULD CLR US FOR THE APCH? INSTEAD WE WERE CLRED TO SUSII WAYPOINT AND HANDED OFF TO BWI APCH. IN MY OPINION; I THINK THE AIRSPACE THERE NEEDS TO BE LOOKED AT (AT LEAST HOW IT REFLECTS ON THIS APCH PROC). PLTS WILL GET A FALSE IDEA; AS I/WE DID; OF HOW THIS APCH CAN BEGIN. OR MAYBE THE HDOF PROC COULD INCLUDE SOME MORE SPECIFIC INSTRUCTIONS ABOUT WHAT APCH THE PLT IS REQUESTING.