Mannnnn, Milwaukee is catching some heat!
Cheese is an acceptable thing to be known for. WI is essentially the home for a good charcuterie board at this point.
Like previously mentioned, a lot depends on where your staying and what you're looking for.
Burgers in Milwaukee: Oscars in the fifth ward! I do like Sobelmans
Pizza: I like balistreri's or barbieres, both are old school italian places. Thin crust pizza...
There are a bunch of solid taco spots on the south side that I would recommend.
A good friend of mine who is a chef explained it to me like this: Milwaukee has a really good food scene but what happens is a chef makes a name for themselves and gains a following and then they hop on I-94 and head down to Chicago. Rent and overhead is just so much cheaper in Milwaukee. There are a lot of up and coming chefs in Milwaukee that I would recommend. Feel free to shoot me a DM if needed.