You could click on the targets too (though it would likely be hard and inefficient), but as Naoki_Yoshida said, er, ahem, Jestor Helosian said, use the target list. I play with a controller and selecting targets is hitting left and right on the d-pad until you have the target you want to attack. I usually have no issue at all targeting unless I screw up with marking lol.

EDIT: for those who may forget, April 1st everyone was shown as Naoki_Yoshida.