Perhaps a simple Like/Dislike system?
Have a vote mechanism. I'll let you decide whether it should have a voting terminal upon entry or a pop-up window on interface as you wander around the strong hold.
I'm not suggesting that it has any impact on prestige points or ranking. No achievement should be attached, but simply show that 'xx people like this SH'. Then the players can decide to visit or not.
On a related note, I crafted the mats mnd placed a ruddy great big patrol ship on the landing pad. Looks awesome! but I got the same prestige points as if I'd stuck a feckin chair on the pad. That's a bit daft.