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I'll express my opinion from a viewer's perspective:
The tournament is interesting.
The optimal team size is 4-5 people.
Matches should be best of 2-3.
The game time should not exceed 6 hours so that you can watch a match in one evening; in this case, substitutions are not needed.
Alternatively, use a blitz format or small maps, such as SM or L, with a maximum size.
The possibility of a Facebook vote after this time is acceptable; it's still better than a decision made by the judges.