I gave it an 8. Its still a superb game, but for me the following points make it lose marks
1) Tracks. For me they could have chosen new cities instead of London, Tokyo and New York again. Theses are boring in my opinion, and if they were going to go back to previous cities they should have at least included Edinburgh which was by and large alot of peoples favourite.
2) Career Mode. The Majors are a major pain for me, as if you choose the wrong vehicle the likelihood of winning the final is non existent. I would have preferred to be able to choose a different vehicle for the final, as you are left with no option but to play through the final with little or no chance of winning it
3) Bikes - at first they were a novelty, but now I find them a major pain and very frustrating to drive. Probably my bad driving though
4) The Cone challenges - the cone gate ones. These are boring beyond belief and hurt my eyes

5) Achievements - ok, a minor point, but they are given away like candy to start with, and the points given for gaining all golds or all platinums are ridiculously low.
The great points are - online, the cars, the graphics, the sound, Shanghai, weather effects, and funnily enough Career mode (apart from my above criticism).
To be honest, I think the series has probably run its course now, although if they were to go for completely new cities next time it may yet have something to offer.
I'm glad I bought it, but felt it could have been awesome instead of very good.
For me PGR2 was and still is the best in the series. That rocked when it came out