While this is well written and thought out, it's kind of a lot of info and talk just to end with a "no duh" conclusion. "In conclusion, this debate is not going away anytime soon."
It also says a lot about the power of the GT franchise when a glorified demo can sell more than Forza 1&2 and maybe 4, depending on how well that finishes. Forza may be a great game, but it has awhile to go before it can claim a victory like that.
That glorified demo was marketed as full as retail game.