I'm going to be different and say Safari for Mac. I know that it's super-quick and amazing and whatnot but... I have this intense dislike for it that probably says more about me than it does about the browser itself. For one, I really dislike its design. I find it uglier than pretty much any IE variant, and that's saying a lot. Also, every time I go into an Apple Store and am forced to use it, it just seems the most unintuitive browser to use. IE may have its legions of faults, but at least you know what you get. With Safari, it advertises complete intuitiveness, but to this day I find it ridiculously hard to use.