A large handful of modders really don't even play online, it's weird, they all play SP even though the gameplay is terrible. Find a good Lugormod server though and I'm down to play, I like the sandboxish element that mod adds.
I liked Spior's makermod server, but trouble is, no one plays makermod anymore, so it's a bit empty. The only lugormod server I have played on was MF, but they have long since gone. I might try out unreal sometime though, if they are still around.