I have played countless hours of GT5 since it came out over a year ago. I feel the reviewer made a very good overall review of the game. it's worth mentioning though, how impressive the online races can be. He commented that there are not many game modes, but the sheer variety to the type of race you can set up is staggering. There is so much variety in the type of vehicle, how the vehicle is set up, the type of track and distance of race, the weather, and time of day, and the amount of assists you utilize, that there is ENDLESS good racing to be had.
The singleplayer gameplay was very dissapionting though. the big problem is the structure of races. Nearly every event in the game has you passing a full field of cars in a very short time. This encourages bad habbits, like smashing into your AI opponents in your frantic attempt to pass 15 cars in 5, 3, or even sometimes 1 lap. Instead, they could have shown drivers what a real race weekend is like. An optional practice session, followed by an optional qualifying session, and a race where your qualifying position determines your start position. Races that vary from brief to long, and some races towards the end that use DAMAGE. Now that's what a good, modern singleplayer campaign should look like.
If you got his references to the specific race cars and race tracks he mentioned in this article, this game is for you. If you are not too into cars or racing, maybe not. I am hooked.