its a big big game, first 40ish percent is set in the 70's and then the game switches to the present.. the present time era sucks in comparison to the past..
the game has very nice car customization options, and the best thing is that even if its wrecked, you can always get your customized car back from the garage for a little fee.
even though there's only one city map, its bigger then liberty and vice city's combined.