You should make it so shrapnel does damage to other things, like zombies, or explosive barrels, or even crates and such. Would give a more realistic feel other than shrapnel passing right htrough everything and colliding only with the ground.
Mine may be bad but here it is: Yeah television rules the nation after all we are human much in common. Oh, come on and do it now. Don't wait and make it better today. The Prime Time around a-around the woooorld never makes us stronger. :D