It's very... busy. Especially in the bumper nether-regions. I like the grills & headlight. And the side "gills" are a VAST improvement over the regular 4-series though. Mirrors are odd shaped. And good luck keeping that tow hook cover in.
I wouldn't kick it out of my garage, but I still think I'd have a hard time parting with my E90. Unless it showed up in that color. While I applaud BMW M for adding color to the line-up... it's just awful.