I noticed this when I was out hunting on my TT earlier today. Don't know if it's intended or not but mobs appear to be very slow at turning. My TT was CL9 and I could easily kill a group of 4 beam-using mobs CL 15-19 simply by flying in circles around them - I hardly even had to use shield recharge. When I was sitting still or flying in a straight line my shield dropped in seconds but with a little turning they almost never fired at me.
I do think it's good that a moving target is harder to hit, but this might be a bit over the top.
*edit* since mob-type probably matters: the mobs were Chavez in Venus and somewhere else I can't remember - but also Chaves.