Just like musical styles, I'm pretty okay with virtually every genre of beer. That said, there are hardly any commercial brews that I crack that are less than enjoyable.
Now, Short's Brewery is a Michigan brewery that's pretty popular out here, and I really enjoy the majority of their offering. However, they SUCK at making a good IPA, including their Huma Lupa Licious, The Liberator (IIPA), and ControversiALE ("strong" pale ale). While these brews may be drinkable to super extreme hop-heads who love nothing but bitterness, these ales are extremely lacking balance. I love the delicious aromas and bite of a hoppy beer, but the best IPAs (DFH's 90 Minute comes to mind) balance extreme hoppines with a proper amount of malt; Short's Brewery apparently missed this memo.