We all love Metamoris and the 3rd edition is the best one up to date. It`s beautiful, intense, crafty and tricky! This is the way jiu-jitsu should be. No points. Only submission.
Check out this highlight video featuring Eddie Bravo, Mendes brothers, Clark Gracie, Royler Graice and others. 

Not usually a spectator sport, but this shows the complexity nicely. Great video!