A WDB ACR MADE A GAR AFTER A VERY POORLY FLOWN BACK COURSE ILS APCH AT NIGHT IN POOR VISIBILITY.

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IN SUM: A DEADHEADING FO IN A WDB ACFT OBSERVED AN APCH TO GANDER (YQX) IN MARGINAL VFR CONDITIONS. THE RPTR STATES THAT THE FLYING FO FLEW A POOR APCH AND LINED UP ON THE LIGHTS OF A FUEL TANK FARM INSTEAD OF THE RWY AT ABOUT 100 FT AGL AT AN EARLY MORNING HR. THE CAPT TOOK OVER THE ACFT AND MADE A GAR. THE FLYING FO THEN MADE A SUCCESSFUL APCH AND LNDG ON THE OPPOSITE RWY USING THE ILS AND FLT DIRECTOR. THE FIRST APCH HAD BEEN A BACK COURSE ILS THAT WAS IMPROPERLY BRIEFED; BUT THE WX WAS NOT AS STATED AND THE APCH WAS NOT PROPERLY FLOWN BOTH IN AZIMUTH AND ELEVATION. A DEADHEADING FE WAS IN THE COCKPIT ALSO. HE DID NOT PAY ANY ATTN TO THE APCH. THE FLYING FE WAS NOT FULLY AWARE OF THE APCH AND WAS NOT AT ALL CONCERNED WITH ITS PROGRESS EXCEPT TO NOTE THAT THE ACFT DID NOT GO BELOW 100 FT AGL. THE GPWS GAVE ONE 'PULL UP' COMMAND AS THE ACFT WENT AROUND. LATER DISCUSSION BTWN THE FLYING CAPT AND THE RPTING FO SHOWED THAT THE CAPT WAS ONLY CONCERNED WITH THE ACFT BEING OFF COURSE; NOT THAT IT WAS GETTING DANGEROUSLY LOW TO THE GND. THE FO THAT FLEW THE APCH HAD TWICE PREVIOUSLY FAILED TO UPGRADE.