E90 just never did it for me, a coupe was the only thing I ever considered.
I think the rear end just looks out-of-whack, and looks especially dated now. No offense to the E90 crowd!
On the other hand, the E92 LCI tail actually doesn't look all that different than the F06 6er Grand Coupe, i.e. the very newest BMW design shapes.
However, I bet the F80 M3 remedies all that. The rear of the F30 looks good, and add some ///M body language to it, and it will look pretty sharp.