WFRP's hit location system has a few things going for it.

1st it only requires 1 roll not a hit and a location roll.

2nd Skill does actually effect the odds of hitting certain locations even though it doesn't appear to do so at first.  Because you as you get better you can ad a to hit roll of 60, 70, 80 and 90 to your list of potential head shots.

3rd The location of the shot only matters if they have different armour and for the final critical.  If they have the same armour all over then you don't need to worry about the hit location (unless you want to) unless you are causing critical damage.  Then the location maters a great deal as a +3 crit to the head will have much different consequences then a +3 crit to the leg.

One other game that relies heavily on hit locations is Riddle of Steel.  Not only do hit locations matter but the type of swing as well for determining what actually gets hit.  For example a downward swing to the head won't freakishly hit the leg while a thrust to the body is very unlikely to hit anywhere else.  It's an extremely interesting combat system the no rules junkie should go without reading.  It's not perfect and is infact limiting.  But it's really worth a read.