As a relatively recent (2010) BMW convert who has thoroughly enjoyed his 2011 MY editions of a 335IS convertible and a standard setup X5, I am saddened by what they have done with the F30. The oldest BMW I've ever driven is a 2007 E90, which means I missed out on all that good stuff that people rave about, and there seems to be very little chance that sort of thing will ever return.
I recently had an F30 Luxury as a loaner. Ordinarily, I love driving loaner cars even if they are lower-end (a Mazda 5 mini-mini-van comes to mind - shockingly fun for what it was), as it means trying something new for a short while and putting miles on not my car. But after a few days of this F30, I was calling my SA and bugging him to give me my car back!
The steering is not just numb, there's something else about it that feels fake to the point of distraction. Body roll is, well, very un-BMW like ( I also had a Sport F30 as a loaner, ok but not great). Suspension feels unconfident, as do the brakes (which I suspect the tires contribute to, as I think CD alluded to).
I see BMW and Lexus like two lines on the fun-to-drive graph, one rising, one falling, and depending on who you ask, the lines have converged or are about to. What direction they will take now, who knows. I don't like Lexus (actually its Toyota I despise) but find myself considering the IS as my next car, 2 or 3 years in the future.
I hope the upcoming G37 replacement kicks both their butts. The first-year G35 I owned for 9 years was a sweet ride but then they too lost the plot.