best burger I've ever had is at HopCat in Grand Rapids. Also known as the 3rd best beer bar in the country, HopCat makes a serious burger. Their crack fries are an excellent pairing, and you can't visit this place without trying one of their dozens of drafts from around the world. They are a brewpub as well, and make delicious ales and lagers.
I've not yet tried it, but my inlaws say the best burger they've ever eaten is at a place called Redamaks in New Buffalo, near the Indiana border in SW Michigan. I guess they are pretty well known for their burger in those parts.
Jon's Drive-In on Mission in Mt Pleasant
Boyne River Inn, Downtown Boyne City
Dogpatch in Munising
The Antlers Bar in Sault Ste. Marie
The Elmira Inn Elmira
Elmira Inn has a thing called a potato burger, imagine getting you fries IN your burger.
go to the original on woodward in n.royal oak. Order it with bacon, cheese, fried egg, and the special sauce. Plan a nap afterwards. It will be needed!. Also, get the onion rings. Enough to share.