I'm glad this old thread has been revived, I was not aware of it, very entertaining reading.
There is one point that I am surprised was not raised - the driver's mat not being secured to the floor despite having eyelets in it. I recently met an ex Brera owner who told me that it was still the same. Surely this is a potential safety issue. I found it fairly easy to fix using some screw-in fittings off ebay. Having once done it, I could do it again in less than half an hour, surely Alfa UK could have arranged for that to be done as pre-sale preparation.
The inability to open the boot with the engine running is just plain crazy, who on earth decided on that and why? I have a phase 3 GTV and the seats were fitted lower than the higher phase 2 seats that everyone seems to complain about, so why could they not change one wire connection so as to fix that silly boot opening. It might seem as a minor carp, but with sub-zero temperatures and a dodgy battery it becomes important if you have to switch the engine off every time you want to put something in/out of the boot, especially if you are not using the car much and then just for short journeys.
Some of the car's shortcomings were fairly easy to fix - fit new non-Alfa rear dampers, fit a decent head unit & speakers, spray paint the high stop light cover & rear speakers covers matt black (were almost white & mid blue respectively). Getting there!