ATR72 FLC LANDS AT AGS DURING WINDSHEAR CONDITIONS.

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CAPT LANDED AT AGS IN A LEVEL 6 TSTM. 15 NM OUT; I SAID 'THE RADAR SHOWS SEVERAL SMALL LEVEL 6 (RED) CELLS NEAR THE ARPT. I HOPE 1 OF THOSE CELLS IS NOT AT THE ARPT; BUT UNTIL WE GET CLOSER; I WON'T BE ABLE TO TELL.' THERE WERE WST ISSUANCES AND ATIS CALLED FOR HAZARDOUS WX ADVISORIES AND WINDSHEAR ADVISORIES. I BROUGHT THIS TO CAPT'S ATTN. ON 8 NM FINAL; WE FLEW THROUGH A 1 NM WIDE; LEVEL 6 LINE. JUST PAST THE DSCNT POINT FOR THE ASR 17; THE CTLR ADVISED THERE WAS HVY RAIN ON THE FIELD AND WINDSHEAR ADVISORIES. SHE READ THE LATEST METAR. 'WHAT WAS THAT?' CAPT ASKED. 'SHE SAID THERE IS HVY RAIN ON THE FIELD' I EXPLAINED. 'NO! WHAT WAS THE WIND AND VISIBILITY?' CAPT ASKED. 'CALM WINDS WITH A WINDSHEAR ADVISORY' I SAID. I CALLED APCH AGAIN AND SHE SAID VISIBILITY WAS 1/2 MI. DURING THIS DISCUSSION; I SAW THE APCH LIGHTS AT 1 O'CLOCK AND PAINTED. CAPT TURNED TOWARD THE RWY. I CALLED IN SIGHT AND WE WERE CLRED TO LAND. WE ENTERED THE WALL OF LEVEL 6 PRECIP ABOUT 1000 FT PAST THE THRESHOLD. VISIBILITY WAS MARGINAL AND WE FLOATED TO 4000 FT AND ROLLED OUT TO DEP END. WHEN WE SWITCHED TO GND; THE CTLR TOLD ANOTHER ACFT THAT THE VISIBILITY HAD RECENTLY BEEN AS LOW AS 1/4 MI. PRECIP BECAME LIGHT ABOUT 5 MINS LATER. I HAVE ALREADY FILED ONE OTHER RPT ON THIS CAPT AND WILL PROBABLY FILE ANOTHER. I HAVE SEEN THIS CAPT BITTERLY INSULT PEOPLE; ROTATE AND RETRACT GEAR PREMATURELY; IGNORE CHKLISTS; LAND WITHOUT REQUIRED RESERVES AND PRACTICALLY RUN OVER HIS ACFT MARSHALER.