It's good, yes, but is it 10/10 good? We've already figured it is a good game, but the reviews seem to think it's the third coming of Half Life (or fifth coming of Halo, whatever). I think they're a liiiiiiiittle excessive on the high scores, what with metacritic's review list taking a good 80-90% before you find one that ISN'T 100%.
As for cars and graphics, come on, it's obvious the screenshots and trailers are all from a special non-release internal pc version with their own high-res graphics and a lot of tweaks to get the most out of it. The real game looks nothing as good, both in variety and appearance.
It's like Skyrim, where it was obvious they faked it with a lot of pre-renders and high-res textures and fog settings hte real game lacks. It's inevitable, the game is made for ancient console hardware and thus looks like crap, but they sell it on the graphics so they have to do hacked PC renders, and while they're at it they have all those vehicles that won't show up all at once when in actual play, so go and force it to preload a certain set for promo shots...
At least the car handling is better. That's a big reason why I can't stand GTA4, even when it's a souped-up sports car it feels like I'm driving a boat. Not a small speedboat, but a cruise liner, like the sort that runs into reefs and capsizes because it has a turning radius measured in miles.