Just a huge disappointment. It's slow (watch as a BMW 3-series can almost out-run you, and a 135i actually can), it has more body roll than an average taxi (watch as everyone almost falls out of their seat when you go around a freeway on-ramp), it has more road noise than an eighteen wheeler, and there's more rattles than you'll find in an average day care center. Buy a WRX and save 10k. I completely regret buying my STI.
The trunk. That just shows you how little there is about this car to praise.
lackluster performance, interior build quality, car stereo needs fixing, Dunlop tires excel at nothing, paint job is cheap, shifter is too imprecise, seats with almost no lateral support, lackluster performance, etc. etc.