I thought they were just okay, wasn't aware they were still at it. It wasn't made "for" me, so I didn't have big feelings about them. They did strike me as more than a little affected-weird vs really-weird; Marilyn Manson vs Daniel Johnson I guess. But a look and an accent unfamiliar to American ears goes a long way, hell I got married owing to both.
I know people try define art various ways, and one of the definitions I've heard is if it gets people talking or more importantly, talking about it. They are not my taste of music, but I do not dismiss them at all.
They chased around a fellow performer at one of their concerts, who was gay, calling him a queer and gay bashing him, which, whatever their views are, is pretty unclassy. I heard it ruined their career.
Chappie is the ****, they did a great job, they are certainly talented and innovative.
I also heard they grew up in one of the toughest slums in Johannesburg, and the fact they made it out of there takes some real talent for sure.