Settle down everyone....When they say "4 door", they don't mean the traditional 4 doors, but the 2 doors with the additional 2 suicide doors like the Mazda RX-8 or many extended cab pickups out there.
You'll barely notice a difference (styling wise), and there will be the added convenience for those of you who use the back seat regularly.
I'd prefer not having the additional 2 suicide doors...it just seems a little hoeky to me. However, it wouldn't keep me from buying an otherwise great GTO coupe.
Personally, I like to see a traditional 4 door car with the LS2 and costing in the the $30k - $40k range. (I can't quite justify to myself spending the money for a CTS-V.)