I wouldn't argue that Miller has a lot of sway in WI but the craft brewing scene is alive and well. I mean if a state could label itself "the home of beer" WI would be at the top of the pack. It might not have as many craft breweries as the west coast but many overlook newbies like Lakefront and established makers like Sprecher when they focus on Miller, Pabst, Schlitz, etc.
The weird thing about breweries in WI is that they cater to a very German palate. Pale ale, stout, porter, IPA, and ESB are not common. Lager, bock, hefeweizen, and Bavarian styles rule the day. You see similar "non Brit" brewing in PA, TX, and OH (and I'm sure others I've missed). The American craft brewers deserve their global reputation of "too much alcohol, too many hops" and the influx of European mainland brewing is great.
I'm no fan of Inbev (though I made money investing in the deal). They've gutted the Belgian craft market. I also despise what Diageo has done to Guinness and fear what they will do to Scotch (but I own their shares in my permanent portfolio - you'd be surprised how many liquors they own). Big brewers just don't make good products.