B737-500 CAPT EXPERIENCED SEVERE WINDSHEAR THAT THE AUTOPLT AND AUTOTHROTTLES WOULD NOT HANDLE WHILE LNDG AT CVG.

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INITIALLY WE WERE VECTORED FOR AN ILS APCH TO RWY 18R. THE WX WAS DYNAMIC AND WINDS WERE SHIFTING FROM THE S TO THE N WITH WINDSHEAR RPTED ON RWY 18R. WE BROKE OFF VECTORS TO RWY 18R AND CHANGED TO FLY THE ILS TO RWY 36R. WINDS FOR THAT RWY WERE NOW OUT OF THE N AT ABOUT 10 KTS AND NO RPTED WINDSHEAR. WHILE FLYING THE ILS TO RWY 36R THE ACFT ENCOUNTERED A WINDSHEAR OF ABOUT +/-20 KTS. THE AUTOPLT AND AUTOTHROTTLES WERE CONNECTED AND WOULD NOT HANDLE THE CONDITION SO I DISCONNECTED THEM. THERE WERE NO PGPWS WARNINGS; HOWEVER THIS RESULTED IN BREAKING OUT OF THE WX HIGH ON THE APCH AND OUT OF THE STABILIZED APCH CRITERIA. EVEN THOUGH I WAS HIGH I WAS REASONABLY ON SPD WITH 11000 FT OF RWY IN FRONT OF ME; SO I ELECTED TO CONTINUE THE LNDG. WE MADE AN UNEVENTFUL LNDG IN THE FIRST THIRD OF THE RWY AND TAXIED TO PARKING. RIGHT FROM THE START OF THE WINDSHEAR I HAD ALL THE CLUES OF AN UNSTABILIZED APCH WHICH SHOULD HAVE RESULTED IN A GAR. MY FO EVEN MENTIONED TO ME THAT WE COULD GO AROUND; BUT I SAID WE HAD PLENTY OF RWY IN WHICH TO MAKE THE LNDG. EXCEPT FOR SIMULATOR TRAINING; I HAVE NEVER ENCOUNTERED THESE CONDITIONS ON THE LINE BEFORE. AFTER MUCH THOUGHT AND REHASHING THESE EVENTS THE ONLY PRUDENT ACTION SHOULD HAVE BEEN A GAR. IF GIVEN THE SAME OR SIMILAR CIRCUMSTANCES I WOULD NOT HESITATE AND GO AROUND.