Found this site for you:
http://www.state.nj.us/oag/ca/ocp/lemguide.htm
I just skimmed it, but it seems that your car qualifies as a "lemon" in the state of New Jersey if it has less that 18,000 miles AND has had the same issue repaired three times OR has been out of service for 20 cumulative days.
I would assume that you may fall under the "out of service for 20 cumulative days" item here. Understand that your blown speaker doesn't count as "out of service", but your clutch problem, the exhaust issue, the rotor problem and, quite possibly, the heat sheild issue could all count towards the cumulative days out of service. Even though you may be able to drive on the bad rotors, it's legally unsafe to do so and you could be cited for doing so, therefore this can count as "out of service" (your car was not "roadworthy").
You may want to read up on the site I linked above for further clarification. It also stated that you have to send the manufacturer a letter giving them one final chance to make good on everything. A template of this letter is even included at the bottom of the site.
I would NOT suggest you go to the dealership to complain. This will only piss them off more. Just send written letters via certified mail outlining everything they need to know. Threat of legal action will spur them more than someone going down there and complaining (although it really couldn't hurt to to so and may even make you feel better!).
Good luck. I hope everything works out reasonably for you.