I think what the BMW design team has done w/ the focused angel eyes and kidneys is really clever. I also think the sharky front end is very sporty looking especially in profile. I think the body of the car is actually very similar to the E90 and I was a bit disappointed that there weren't more significant changes made to the flare styling of the E90. Don't get me wrong, I love the flare/E90, but I was just looking for a more significant transition. When you look at the transitions made through the history of the 3 Series E30>E36>E46>E90 all of these cars made big steps, body-styling-wise. The F30 makes an incremental change in design.
Until I drive an F30, I won't truly know how I feel about the driving experience, but from what I've read, it seems like the experience has been watered down a bit. Don't like what they've done to the steering. The engine specs don't excite me. I guess I'll wait for the coupe/convertable/m3/4 to come out to see if my feelings change.
Right now, if I had to upgrade, I'd get a 335 E92.