If you look at ratings for this game all over the Internet, you'll find an average mark of 6.5/10. I think this game deserves a little better because most reviewers insist on little glitches which don't really spoil the experience.
Fuel has a good lifespan. Online races with friends are really excellent. I didn't encounter any lag. Graphics are pretty good and weather effects really do much for atmosphere.
As far as driving mechanics are concerned, they're better in my opinion than those of Motorstorm which I think are too fancy and unrealistic (unlimited turbo anyone?). There are six classes of vehicles and they handle pretty differently. They all differ in terms of handling, grip, braking power, resistance and so on. The ground you're driving on is also quite important and cars and motorcycles will react in a very different way depending on its nature.
Overall, you get the best taste of Fuel taking your time: it is not a game for someone in a rush. Unlocking the faster vehicles takes a little time but it's worthwhile. Fuel is not a simulation game either but driving the faster vehicles with the first-person view (yes, THERE IS ONE - obviously game testers don't do a thourough job anymore) requires some amount of skill and attention. I particularly enjoy the quad vehicles: they simply feel great.
The only thing I regret is the lack of offline multiplayer. Likewise, if you don't have your PS3 connected to the Internet, you're likely to miss out a big part of the fun Fuel can provide.