NEW B737-700 CAPTAIN REPORTS UNSTABILIZED VISUAL APCH FLOWN BY FO.

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IT WAS OUR FIRST LEG TOGETHER. AS THE CAPT; I WAS THE PLT MONITORING. THE ENTIRE FLT WAS NORMAL. THE CONDITION WAS DUSK AND VERY CLOSE TO NIGHTTIME CONDITIONS. ABOUT 5 MI FROM FIELD; THE APCH CTLR ASKED IF WE HAD THE FIELD. I DID SEE THE FIELD BUT I ASKED THE FO AND HE SAID HE DID NOT. ON DOWNWIND THE CTLR ASKED US AGAIN IF WE HAD THE FIELD. ONCE AGAIN THE FO SAID NO; SO I ASKED TO BE VECTORED ON FINAL. THE CTLR TOLD US TO MAINTAIN 2500 FT AND TURNED US FINAL. BY THE TIME THE FO SAW THE FIELD; WE WERE TOO HIGH TO MAKE A SAFE APCH. NOW THAT THE FO HAD THE FIELD; I ASKED FOR A BOX PATTERN BACK TO THE FIELD. THE CTLR CLRED US THE VISUAL AND GAVE US A R BOX TURN. THE FO BEGAN A R TURN AND A DSCNT. ON DOWNWIND; HE SAID HE SAW THE RWY WHICH WAS OUT OF MY VIEW. AS HE STARTED A BASE TURN; HE REALIZED THE TURN WAS GOING TO BE TIGHT AND ROLLED INTO A STEEP BANK; APPROX 45 DEGS. I CALLED BANK ANGLE AND AIRSPD AS HE SLOWED TO REF SPD. ABOUT THAT TIME WE GET A 'CAUTION OBSTACLE.' HE BEGAN TO PULL UP WITHOUT PWR AND I CALLED 'AIRSPD.' THE FLT PATH WAS CORRECTED AND WARNING CEASED. THE APCH CONTINUED AND AT 1000 FT WE WERE ON SPD AND NOW SLIGHTLY LOW ON GS. WE WERE NOT QUITE LINED UP WITH THE RWY BECAUSE WE HAD GONE THROUGH FINAL ON THE BASE TO FINAL TURN. I CALLED 'GS' AND BY 800 FT WE WERE LINED UP ON GLIDE PATH AND SPD. THE LNDG WAS NORMAL. ALTHOUGH THE APCH WAS STABLE; IT WAS JUST UGLY. AS A NEW CAPT; I TRY NOT TO FLY THE JET FOR THE FO. AFTER THE FIRST GAR/BOX PATTERN; I REALLY DID NOT WANT TO GO AROUND AGAIN. IN HINDSIGHT; I SHOULD HAVE DIRECTED A GAR AFTER THE 'CAUTION OBSTACLE' BUT SO MUCH WAS HAPPENING AT ONE TIME; I DID NOT. IT WAS CLOSE ENOUGH TO NIGHT CONDITIONS THAT A GAR WAS WARRANTED. ENOUGH PAX MADE COMMENTS ABOUT THE APCH THAT I THOUGHT A RPT WAS WARRANTED. LIKE I SAID; I AM A NEW CAPT AND REALLY DO NOT WANT TO BE ONE OF THOSE CAPTS THAT FLIES THE JET FOR THE FO. IN THIS CASE; EVERYTHING HAPPENED SO FAST I WAS JUST MAKING DEV CALLOUTS TRYING TO GET THE ACFT ON THE GND. FO HAD BEEN HERE 10 MONTHS AND COULD DO MUCH BETTER. I ALSO KNOW HE WAS EMBARRASSED. I REALLY THINK IT WAS JUST A BAD DAY FOR HIM. I KNOW IT IS MY RESPONSIBILITY TO 'INSTRUCT' NEW FO'S. IT IS A FINE LINE BTWN INSTRUCTING AND FLYING THE ACFT FOR THEM. I AM STILL LEARNING WHERE THAT LINE IS.