Since reading about the DA combat model, I'm starting to think that 'Lucky' is a pretty darn good pick for 1 point.

A race without luck will roll (0 to weapon rating) for every weapon. The average damage is rating/2 and over a large battle, you are going to get pretty close to the average damage.

A race with 25% luck rolls from (rating*0.25 to rating). That is, the minimum roll is 0.25*rating and I assume it's uniformly distributed across that range. So a normal race with a 4-damage weapon has an expected damage of 2, while a 'lucky' race has an expected damage of 2.5.

That may not seem like a big difference, but it's pretty big in my eyes. It's a 25% increase. Adding 25% luck increases your expected damage by 25%, just the same as if you had a 25% weapon bonus. It's actually arguably better, because a weapon bonus get's added to the first weapon shot while luck helps *every* weapon shot, so less is wasted on overkill. The drawback is that it doesn't kick in until you get higher-damage weapons while weapon bonus can help if you have a lot of 1-damage weapons on a ship.

I don't know what else luck does, but it looks like there is a 'luck factor' in planetary invasions as well. Well worth a single point IMO.