I think it sounds great for an OEM rig. I've got the bass and treble maxed like an amateur, and the sound is surprisingly non-fatiguing like that (it almost seems as though they tuned the system with the expectation that people would automatically boost those controls). The bass from the spare tire sub is nice and tight. Tweeters clear and not overpowering. Decent mid-range, but could be better (probably my fault for maxing the lows and highs).
OEM Silk Dome Tweeters matching perfectly with the system? Gets the thumbs up. I mean those that upgraded the Gen1 fronts to aftermarket speakers found they were either a bit quieter than stock or were a bit harsher than stock.
The matter for the stock sub in the back. I've seen numerous people upgrade Stock Wheel Well housings with better speakers yet still retain that clean OEM look.