While its exterior design is certainly polarizing, the interior of the BMW i3 has largely been praised by all who've seen it for real.
In this video, Benoit Jacob, head of design at BMW i, discusses the interior design of the BMW i3:
"Redefining urban mobility means thinking far beyond environmentally-conscious and agile driving. The result: with its visionary design, the BMW i3 design defines the automobile of tomorrow. Its innovative BMW eDrive power train was designed in the scope of the BMW EfficientDynamics technology and is not only locally emission-free, but also offers an incomparable and near-silent driving experience."
It's almost as though two different designers were in charge on the i3. One for the exterior and one for inside. However, that's not the case, as Benoit Jacob was responsible for what you see of the i3 both inside and out.