Personally I like his voice. It's distinctive. There are so many popular artists around these days with almost exactly the same voice, what I would call the "American Idol" sound. I hear so many young vocalists who sound identical right now, it's spooky. They all adopt the exact same vocal inflections and timbre, even a lot of the so-called "serious" artists who write and play their own music. I rarely hear anyone whose voice stands out as different. You hear people say things like "what a set of lungs on that girl," "he can really hold a note" or "what soul!" (which is just another way of saying they close their eyes when they sing and warble a scale run around every note) but never "he sounds like nobody else."
Weird or distinctive voices grow on you as an acquired taste. So much of today's music is sugary sweet and designed to have instant appeal but it's ultimately disposable.