Well at the time when I was a newb, it was the best thing that sounded good with my E90 and my way to small 10 JBL sub and my HTR Yamaha reciever. Lightning took care of the reciever, so I upgraded that, and realized the huge difference in sound. I then realized that my sub couldnt fill the massive living room, dinning room, kitchen combo as seen in the link below. So I got the 15" Titanic Kit... WOW!!! Got it 2 weeks ago and love it. I do have the system crossover point at 80Hz, and it makes the subs on the E90s a little pointless.... which are lacking in the upper mids and into the highs for the room size. Honestly the center sounds good with the E90s, however I see your point and would have to agree.... wont go good with premium 4-corner speakers.
http://www.squirrelpf.com/frank/gallery/ffp_misc/
Frank