I just got done playing a tough game on a large map. this time around I decided to try the attack%(50%) bonus racial and play as the yor. after the initial land grab i had a very large number of stars and I was putting tremendous presure on the drath who quickly declared war since i had no military. just a short couple of turns later i produced my first medium hull with 4 missile attack. the drath had better logistics and more ships but i was able to kill them all with reative ease since i was doing 150% dmg. after rapidly defeating the drath my influence swelled and eventually i made sweeping moves against the torians and the humans both of them fell in short order as while they had numerical superiority they simply couldnt keep up damage wise. i feel confident i couldnt have killed 270+ships and lost less then 15 if it hadnt been for my extrodinary damage output from nothing more complex then photon torpedos.
on a second side note i had teching set to 'very fast' and the AI didnt seem to handle it very well, aka didnt really reaseach end game techs but even if it had i dont think it would have mattered much since none of them had consolidated into larger forces before i became too large.
edit: oh i just figured it out, i think +attack % (50) is like have almost an extra 50% minaturization for the majority of the hull. so if youve got say 100spot, take 30 for misc items and 70 for weapons its like piling on 105 and you didnt pay for the extra 35.
