I’d be interested in an outlet that has reviewers actually finish the game before writing their review. I get the perceived need to release a review as early as possible, but personally I’m willing to wait if it means a more accurate, thorough review (I’m more of a “patient gamer” these days anyway).
Inviting guest reviewers could also be a good idea I think. Always good to get different perspectives and voices.
As for mediums, I prefer video for reviews as it allows for demonstrations of different aspects of the game. This is especially helpful when talking about a game’s performance and artistic direction.