I was a tamer in the cb. They do the most point damage overall to the rest of your team if you just hold down the left mouse button the whole time while spamming your ASDF keys when you feel like it.
My most useful skills was Wisp & Swarm (the bees). Bees have homing and the Wisp is high damage/Homing on one enemy. The next best skill would be the Dogs that criss-cross on your screen. The Crows was pretty lame, i'd avoid that skill.
I just held down Z. o.o
Movement with the mouse bugged me. I hate how the spells don't go in a straight line. Or how your monster goes for the first thing that shows up, usually a big monster, leaving the weaker monsters to mob up and go crazy shooting you.