I suggest a ranking system based on different attributes for at least the campaign levels (better would be for all scenarios including user-created content).
Attributes:
    - time to complete (shorter is better)
    - block amount (smaller is better)
    - ...

 Therefore I would like:
    - a graph system (to see the variety and your own position)
    - a list system (to see the current position as a number)

=> to visualize/show global results (and results from friends)