The i3 is definitely polarizing, but looks absolutely nothing like an Aztec (which is also polarizing). I actually find the Buick Rendezvous (same car basically) less attractive than the Aztec, but they definitely sold better.
I think the i3 looks best in either black where it hides the different colored roof, or white where it emphasizes it, but I would take it in other colors too. I am hoping to pick up a nice used Fluid Black i3, or maybe have to go older and get the storm trooper looking one or maybe the dark grey.