IMO front/front quarter is definitely best but the car also looks stunning from above (I keep looking at it out of upstairs windows). Also the area around the front arches where the bonnet shut lines are is fantastic - even with the bonnet up!!
Even though as a whole I love the car, I'm afraid I agree that there is something not quite right about it's rear. In fact, I'd go so far as to say it's bum looks big (probably due to the wide track). I think it looks better without the chrome strip on the rear bumper (this emphasises the width too much).
It also looks a bit "hippy" round the rear - sort of love handles I guess (reminds me a bit of the mid-engined Renault 5 from the '80's).
I disagree about the interior though - it's so much better than the dull dashboards on offer elsewhere. Worthy of a car costing 3 times the price and a major reason for me buying a MINI.