The most sensible post so far on this thread was the one about ther but for the grace of God etc...
Indeed, the man who never make a mistake never made anything, we all screw up once in a while which is why we have two people up front to keep an eye on eachother. The PNF should always be alert and ready to cry foul. Complacency is the great enemy.
If in doubt hit the power and go round, even if you only have an unexplained feeling that something is not right, you probably dont have time to figure out what is wrong, just get out of there.
I have never understood why so many pilots feel that a go-around is somehow shamefull or a sign of weakness.