"Hotness" is more a measure of popularity than talent, and regardless of how you feel about his music, Lil Wayne is the most popular rapper working today—by virtue of Soundscan statistics alone. We all know how much Tha Carter III sold first week and Weezy's other sales feats, and MTV's list is about current accomplishments, not past, but even then, Wayne still stands as the most successful MC in many ways.
Tha Carter IV, went double platinum, in an era where it's increasingly difficult for rappers to sell that much. He also just broke Elvis Presley's for most songs to chart on the Billboard Hot 100. Elvis! If that's not hot, what is?