We've been cottage owners on Manitoulin for over 20 years and no one had ever even suggested the Edgewater until the new management took over this summer. We made the half hour drive last night, and are sure to do it again! The food was great, and the staff was very pleasant in spite of being a bit overwhelmed by the crowd. Nice enough atmosphere inside, but next time we'll make reservations and sit outside on the deck.
From what I've learned, the new management has made it a totally different experience, so TripAdvisor reviews prior to May 2012 are really not relevant.