Yea, Im not even into video games much, but Ive played it at Blockbuster last weekend while renting a movie, and must say it's on a entirely new level from GT for playstation. The car games are about a close to the real deal as I could imgine.
i dont know if there are more than gt4 but it has the 05 gt, 01 cobra r, 68 shelby gt 500, 01 saleen s281, and the tiger motorsports race car that was featured in one of the mustang mags a few months ago.