FLT CREW OF TWIN ENG TURBOPROP ON IFR ARR IN MARGINAL VFR CONDITIONS AT 6A2 RECEIVE POOR ATC HANDLING.

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ARRIVING AT 6A2 (GRIFFEN-SPAULDING; GA); THE AWOS WAS RPTING 1200 FT CEILINGS WITH 7 MI VISIBILITY. WE REQUESTED A GPS RWY 14. THE CTLR (ATLANTA APCH) ASKED IF IT WAS FOR A 'PRACTICE' APCH BECAUSE AN AIRPLANE HAD MADE A VISUAL APCH WITH 'NO PROB;' NOT 10 MINS EARLIER. WE QUESTIONED THIS BUT AGREED TO ACCEPT THE APCH. WHEN TOLD THEY (ATL) COULD LET US DOWN TO 3000 FT NOW; AND 2500 FT IN A FEW MOMENTS. 2500 FT WAS THE MINIMUM ALT SHE COULD DSND US TO; WHICH WE FOUND ODD SINCE THE CEILING WAS 1200 FT; AND A PREVIOUS ACFT HAD MADE A 'VISUAL' FROM 2500+ FT? THE CTLR ALSO INDICATED THAT A COUPLE OF ACFT WERE WAITING FOR US TO GET IN; FURTHER PRESSURING US TO TAKE THE VISUAL IN ORDER TO EXPEDITE OUR QUICK ARR. AFTER DSNDING TO 3000 FT; WE WERE TOLD THAT WAS AS LOW AS WE COULD GET UNTIL PAST THE ARPT. AS WE OVERFLEW THE FIELD; WE ONLY HAD VERY BRIEF GLIMPSES OF THE GND THROUGH THE UNDERCAST. AFTER PASSING THE FIELD; WE REQUESTED THE GPS APCH (AGAIN); AND THE CTLR AGREED AND GAVE US A HEADING THAT WAS DIRECTLY TOWARD THE IAF; BUT DID NOT TELL US WHAT SHE PLANNED FOR US. AFTER A MOMENT; MY COPLT CALLED HER AND ASKED HER WHERE WE WERE HEADING. SHE REPLIED THAT WE WERE GOING TO THE FAF; BUT SHE COULDN'T PRONOUNCE IT; BUT GAVE US A TURN TO THE R TO INTERCEPT THE INBOUND COURSE. GIVEN THIS WE STARTED TO MAKE AN ADJUSTMENT IN THE GPS; TO GO DIRECTLY TO THE FAF; INSTEAD OF THE IAF. WE WERE SO CLOSE TO THE INBOUND COURSE; THAT WE WERE THROUGH IT BEFORE THE GPS DISPLAY CAME BACK UP. I DID NOT CATCH THIS IMMEDIATELY; BUT AFTER A FEW SECONDS REALIZED BY EXPANDING THE SCALE; THAT THE INBOUND COURSE WAS BEHIND US. BY THIS TIME WE WERE COMING OVER A SCATTERED UNDERCAST AND BEFORE I COULD DECLARE THE POSSIBILITY OF CANCELING AND GOING VISUAL; THE CTLR CAME ON AGAIN; AND TOLD ME TO MAKE AN 'IMMEDIATE' TURN TO 270 DEGS; AND CLB TO 4000 FT. I COMPLIED; SHE THEN TOLD ME TO FLY TO THE FINAL APCH COURSE AND HOLD WITH R TURNS. (NO INSTRUCTIONS AS TO A DISTANCE OR FIX OR INBOUND OR OUTBOUND; OR LENGTH OF LEGS; ETC.) AFTER REACHING THE COURSE; I BEGAN A R TURN. NOW ANOTHER CTLR (MALE); CAME ON AND CLRED US FOR THE APCH. AFTER COMPLETING THE TURN; WE TRACKED IT IN; AND BROKE OUT AT ABOUT 1500 FT. BEST WAY TO AVOID THESE PROBS; DO NOT LET ATC PRESSURE ONE INTO TAKING A VISUAL APCH; WHEN THE AWOS INDICATED A LOWER CEILING; THAT IS BELOW VECTORING ALT.