The best way to get to rank 5 is just undermine the nearest system possible , go back and forth from a close controlled system to any "ennemy" faction . Interdict ships from that faction, or even better get interdicted by any other faction and you get ton of merits. It's still a long grind , unsatisfying and useless but it helps to rack credits and that's all there is to see.
Seen sytem undermined at over 3000% while others were left untouched , cause its the most efficient way . No one is really trying to play powerplay , cause there's no reason to do so, even if my faction would be annihilated(highly doubtful it will ever happen) then what ? i'd just switch to another souless faction i dont feel any loyalty towards.
That's pretty sad, the gal net thing is an improvement, i like the stories , but the reality is when i tried open space , no one is even talking to each other,no cooperation, just mindless bots grinding merits, nothign really going on .