Read the article that Cryptic published on skills and how they work.
the numbers resresent percent to damage (not crit). Same for the skills you level up like star ship beam weapons. The skills stack as well with other skills and items so they appear to be good however I would not agree that they are the best.
I would rather have abilites that influence the power generated on your ship and efficency than a raw 3 or 6 percent.