I agree with RussianX!!
And agree with Hylis (mine was just an idea to suggest

like always)
I think you played to fps games when we was younger, you remember???
Jump, click mouse, jump, jump, click mouse and launch mouse in the air when the challenger kill you, ahahah!!
Was really fun the first time we played to it, but now??? I know you will develope something really fantastic, cause you have the editor (the secret weapon), but for the gameplay something special must will be there!
Do you think someone will do a community based on shot, shot, jump, jump, respawn, oh my god i was killed while respwan???? I don't think so.
To MikePurdy : Well Mike, i don't wanna be a teacher, but, today, with coding, there are some trick to show millions of players online without lag: dividing the map in sections, hiding too far away players out of the range, etc, etc...
Is sure each game must have a single player campaign, but i think, just like tutorial to understand commands.
The NET is the key. I will not buy SM to play alone.
Edit: To last post of Mike....
This can be great, while racing i see Mike shooting Zooz under the bridge i'm crossing with the car, ahuauu, nice!