Like I wouldn't mind full turning on all of them if they did like so:
Targe=Defensive, after you get your kill you can fall back with relative safety
Screen=Offensive, if you want to dunk heavies and beat the shit out of people with the bash and slash, this is your girl
Turner=Speed, if you want to try and chain together kills with mini crits, this shield is going to be your baby.
I think if they did an approach like that, it'd work out swimmingly for all the playstyles involved.