Why slow down movement in combat?

This is my biggest beef with this game.  Combat slows to id say 50%.  I try to rez a  companion, when fighting a dragon, and before i can even rez him/her im in a fire storm that kills us both.  and even if i see the fireball i cant get out of the way unless im already straffing, and i still get hit 80% of the time.  I have Blackwall pimped with 60% fire resist gear and he still dies on first contact with dragon breath.  Plus there has to be something wrong with the AI.  After everyone is dead i can go toe to toe with the Western Approach dragon and almost beat it, but if i have all 4 comps i lose horribly.. I have them set to use there abilities but they dont use them unless i take control. fix it!!!!!!! And how is it when i get the dragon to 20%, then rez a comp,  all of it all of a sudden has full health and armor back?!