Since I don't really believe archies place bunkers willy nilly (ie randomly), I have come to think of randomness in terms of conditions reducing or increasing the impact of bunkers. Even if bunkers are very well placed, I suspect 50% effectiveness rate is damn good and thats a good thing. Imagine with the number of bunkers archies use if nearly all of them effected nearly all players...very boring outcome for sure. There can also be bunkers which seem like they are placed strangely, but become effective after a poor drive...especially semi-cross bunkers (leave an unappealing gap for rabbits) where now the issue of can the carry be made comes into play. These days, bunkers like this can be placed at distances where very good players need to take them into account for their tee shots...thus increasing their effectiveness.
Mayday, I don't mind bunkers cutting off the ground game approach off of a slope so long as there is some room to pull off the shot if one is in good position.
Ciao