As several others have noted, "hate" is the wrong word. Opinions are a dime a dozen in this hobby and everyone has one. It's a simple issue of different people having different preferences.
I've heard Wilsons many times and they are not my cup of tea. I don't find them all that natural sounding. They suffer from what I call the "Kodachrome" effect -- impressive, but, to me, not natural. Throw their price tag on top of that and my response is "definitely not for me."
You can blame the set up, associated equipment, room acoustics or whatever, but my impression has been consistent in every encounter.
That said, lots of other people love them. Not much different from the way people respond to every other category of products out there, whether cars, cameras, cooking equipment or whatever. Big deal... buy what you like and leave the rest.