Just personal taste / opinion here, certainly not requirements, but here's what I've been looking for in a server:
Uploads allowed:
Doesn't have to be a lot, even just three to five blue prints per player would be fine. I get that some admins are concerned about players bringing in massive super ships or resource block BPs, or that some admins want to keep a certain flavor to their server,but in a game like this where player creativity is such a massive selling point, it's kind of a bummer to not be able to bring Your favorite ship with You.
Server administration can always wipe out a BP if They find it disagreeable in some way (Preferably after talking with the player that owns it first).
Buy with blocks would be acceptable if necessary.
Top speed:
I know the game's code may not be able to handle crazy speeds like 1,000 kph online, but I've seen plenty of servers pull off up to 300 kph with no issue.
I've also been on servers running at 50 kph that lagged like a mofo...
Vanilla / mostly vanilla:
It seems the bulk of the servers out there are either running RP / Lore specific servers with strict rules, or heavily modified economies, or heavily modified block behavior configs, or are relying on all sorts of heavy server-specific rules. All of this is perfectly cool and adds flavor, but it'd be nice to have a plain old vanilla server. Some place where players can show up and do what They do and fly what They fly (within reason) just like in SP, but with other players in a world filled with things outside Their control.
I love playing legit PVE survival, but so many servers are trying too hard (In My opinion) to be "hardcore", and do things like making everything rare/expensive/dangerous. Again I get that the admins are trying to deliver a good challenge, but dude, a little slack would be nice. You want to tweek the economy / item availability a little? That's cool. Just don't be a masochist about it. I was on one server, where there were no mobs to be found, because Their spawnrate was altered, and out of three pirate stations I rolled (In a 240 mass fighter no less), not one of them had anything in their storage boxes, by intention of the admins...
PvE:
PvP's cool, got no problem with it. Even though I'm not a PvP guy, I actually like PvP servers, as I know I'm clear to defend Myself, if a situation calls for it. (I've been on servers that forbade PvP, which left the players no choice but to put up with harassers / trolls with no recourse)
We've already got a few servers that are popular PvP spots for the competitive teams out there, it'd be nice to have a server with more of a focus on PvE, or to be more precise, no focus on any one thing.
Lot's of custom mobs, maybe with the admins manually spawning in a few really nasty mobs in a specific spot every now and then as a event or something. Or if it were Me, tell the players I've spawned in something epic to fight in X,Y,Z, and when the players show up, BAM! Giant spongebobs EVERYWEHERE...
PvP by agreement. Gentleman's duels with no hard feeling. Keeps the drama down.
Big sectors:
It looks great, and cuts down on some of the oddities that occur when crossing from one sector to another. I've got My SP running 10km sectors..... It's soooooooooooo roomy.
Firm but fair administration.
Fascist admins may drive players away, but admins that are to scared to act can do just as much damage. Trolls love these kinds of admins, as They're never quite willing to step in and act.
Again, You don't have to be a jack-booted thug of an admin, but You've gotta be willing to wield the mighty pimp hand when the need arises.
...OH GOD WHY DO I ALWAYS DO THESE WALLS OF TEXT!?!
My post s are bad, and I feel bad...