extremely high marine losses.

[Soppe]

It's random.
1st boarding: killed 2 bil marines, lost 1 bil
2nd boarding: killed 800 mil , lost 1 bil
3rd boarding: killed 200 mil, lost 1 bil
That last one hurt me dearly..

idk about u, but that doesnt make any sence what so ever ;)

[Seither]

It's not random, the only thing that is random in this game is the amount of damage your ship will do, and that has numerous peramiters on it's random number generator. So it isn't completely random either.

It may seem wrong and such, but it is right(though it sucks), and crew level doesn't effect marines, that I do know.

[charmuska]

I've noticed that if you board in quick succession, your marines do worse and worse.  If you wait a minute or two inbetween, your marines start to do well again.  But not completely well...oh hrm...