We've actually gotten quite a few people from Roblox who are smart and mature. A lot of them don't even say anything about coming from Roblox, because some people on Blockland are in fact, jerks. I've never played Roblox, but from what I hear, it's a lot like Roblox. You make a server (Build a place) and other people go to the server list, and choose to join the server (People come to it.). You make/download add ons to add more to the game, and interact with other people who come to your server.
I don't feel that I'm experienced enough to say any more about Blockland. U_U