I've been a regular visitor to the West Pier Drive-In in Sault Ste. Marie, Michigan for many years now. It's a must-stop if you're in search of an excellent burger--it easily makes my top 5 for burgers anywhere. The burgers here are thick, juicy, and appear freshly made--definitely no food distributor-quality meat. Fries are the harder-to-find crinckle cut variety and are just the right consistency. The service is excellent.
As noted by one other poster, it is a little out of the way and away from the main attractions near the Soo Locks, but just follow the sign for "West Pier" and it's easy to find from there. The lot/atmosphere is lacking a little bit with the relatively recent condo/apartments built just to the west of it and lack of areas in shade to park, but these are shortcomings that are more than made up for by the quality of food and service. You'll be coming back for more!
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.