Same impressions I got here from a 328i sport which I had for a few days. The car had 12 miles on it when I picked it up. however, one of the immediate differences I noticed from my e90 were the relatively-mediocre brakes. I thought, well its new so probably the brakes just needing to adjust to the rotors. But 200 miles later, brakes had not improved much. Again, maybe they do get better with a few hundred miles, but apparently not.
The 328i and the n20 are an amazing combination. BUT, this is not a car designed for performance driven consumers. This car while amazing in its own right, will mostly please 9-5'ers who just use their bimmer for work, commuting, rentals or whatever. This is not a performance car in its commercial state at least. Having said that, I have full confidence that the 328i would complete most day to day tasks with ease, while truly putting any comprable competitor to shame. It's truly an impressive car, and the N20 paired with the 8 speed auto are great feats of engineering for BMW.