I don't enjoy anything on ROBLOX, never did. Everything is incredibly laggy on there, the people who play it are tampons who are extremely cruel, they are selfish, and you are very limited to making stuff on ROBLOX compared to BL where we can upload our own meshes, music, etc.
Quite frankly, it is extremely possible to create good servers like you listed, and in fact, there are many out there but most are under development.
I just want to point out, you can do those in Roblox as well. Also, We don't give a stuff what you think of the game. Stop derailing the god damn topic. You have nothing to do with this, so shut your mouth.
OT: I somewhat understand what your talking about, and yeah, that would be really neat. The way the camera would work is the only problem I can think of, not to mention the player movement.