CAPT OF B737-500 CONTINUES UNSTABILIZED APCH TO LNDG AT IAH DESPITE PROTESTATIONS OF FO.

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UNSTABILIZED APCH BY CAPT. R DOWNWIND FOR ILS RWY 27; NO SIGNIFICANT TFC DUE TO REGIONAL WX. ATC WARNED US; THEN TURNED US IN FOR A TIGHT FINAL (PLENTY OF WARNING; BEFORE ABEAM NUMBERS). CAPT TURNED BASE. I UPDATED FMC BECAUSE HE WAS INSIDE ACTIVE WAYPOINT AND SEQUENCING WAS NOT OCCURRING (I COMMUNICATED THIS). I COMMUNICATED THAT HE WAS APCHING 1700 FT; WITH NO FLAPS OR GEAR. CAPTURED FINAL. AFTER REPEATEDLY TELLING THIS BRAIN SURGEON THAT HE HAD A CLEAN WING AND NO GEAR AND WAS FLYING AT 210 KTS AT 1500 FT; THE CAPT STARTED TO CONFIGURE FOR LNDG. I PROCEEDED TO SUGGEST THAT HE CONSIDER A MISSED APCH; TFC AND WX WAS LIGHT AT THE FIELD. I MADE THIS SUGGESTION AT LEAST 3 TIMES. I MADE THE JUDGEMENT CALL THAT WRESTLING FOR CTL AND TAKING A LIGHT B737-300 ON A MISSED APCH WAS MORE HAZARDOUS THAN LETTING MY 'MENTOR' LAND MIDFIELD WITH 5000 FT TO STOP. I WOULD HAVE; FOLLOWED BY A 'CP' OFFICE VISIT; IF THIS SIT DEGRADED ANY FURTHER. MY COMPLAINT IS NOT THE INITIAL HUMAN ERROR; BUT THE DISREGARD FOR COMPETENT HELPFUL CREW INPUT. THIS ASAP RPT WOULD NOT HAVE BEEN FILED IF HE HAD MISSED AND TRIED AGAIN.