I recommend Tony's in Birch Run right of I-75 exit 136 (and the Saginaw County ones of the same name). Large portions, great steak sandwich, and breakfast served anytime.
Saginaw County - Best Chinese place is Hunan's near the Fashion Square Mall.
Grand Traverse Pie Company - it was okay, but overrated to me and overpriced.
Zehnder's - definitely the best of Frankenmuth's many places with their fried chicken family meals. I've taken out of town family and friends there who much loved the food and service.
Greektown - Pegagus and Parthenon are my favorites in terms of food selection and reasonable prices (hope they are still there)
Buffet - best one that is also reasonably priced with good selections is Kewadin Casino in St Ignace for $15 at dinner time (not counting a drink). Most of the other casinos are over priced for their buffets, but I cannot judge if the food is worth the money as I am not willing to fork over $20 plus cost of a drink for the privilege.
Fish - Hill's Bar/Tavern in Shields (on M-46 - Gratiot Road) - they have the fish selections and specials mainly on Fridays and Saturdays, all you can eat, choice of potato too.