Is there a "The Leftovers" controversy I'm missing?
It's an excellent show, but if you don't like it then yeah, stop watching. I didn't find it controversial, but it has religious themes, which can be personal to people, and death/loss is a heavy subject.
For those that haven't seen it the basic premise, as the article states, is that 2% of the population disappears one day. So then what happens? That's the show.