BMW is not all about speed/acceleration

It has magic combination of ride quality and handling including 528.

528 actually has best front/rear weight distribution among other 5 series and if equiped with a manual transmission, its fun to drive.

BMWs are NOT "ultimate driving machine" really but don't forget 3/5 series are sedans. While they can't outhandle some dedicated sports cars they have best combination of power, practicality, handling, and riding.