I noticed last night when playing a rough defensive game, the Fighter/Bomber AI needs a beating.  While I was defending my planet against a few caps and a host of frigates, I noticed that whenever siege frigates entered into the picture my BOMBERS would immediately break off and go after them, while my FIGHTERS kept on plinking the cap ships.  Only after the siege frigates were destroyed would the bombers go after what should be their primary targets, the BIGGER ships.

In fact, the whole time, with frigates all over the place, the FIGHTERS would ignore them and go after the cap ships.

Judging based on damage bonuses, this is completely backwards.  Fighters should be attacking everything small first, working their way up, while bombers focus on everything large on down.  It's disturbing to watch 15 bomber squadrons fly right on by a nice juicy cap ship to go waste the next 2 minutes on a frigate.