Driving has never been so... ordinary. But for the price, it's okay.
And that's probably what the worst thing about this game. It's mostly a "sunday ride" game. I never felt the urge or the energy to do more than just driving around. To get money, you race or do delivery missions. But nothing forces you to go after money. If you are not an addict of "gamer points", there is no real reasons to race, other than wanting a new car.
Technically, the game suffers of some really annoying bugs. Cars that appear right in front of you when you drive, cops that arrest you because you were pushed into their patrol car by a stupid AI, a lot of pixelated textures, backgrounds not loading fast enough (a lot of pop up, even when driving at low speed), some hiccups... and the list goes on. These bugs are not that important, but they contribute to ruining the game experience.
I mention earlier that the graphics are acceptable. It's because I found the sceneric background poorly detailed. In the city for example, I was expecting more details on the buildings and streets. I have a XBox 360 and an HDTV, there should be better graphic, don't you think. Isn't that the reason Microsoft gave to convince us to buy a 360? But I suppose this was to be expected since the loading from a DVD drive is quite slow. Maybe graphics will improve with the PC version, where everything will be on a fast hard drive.
Most of the enjoyment of driving comes from the scenery. But after a while, it becomes very repetitive. The city is not that big, and the coast line becomes boring after a while. It would have been nice to have more "special" scenary (how about a volcano, or some interesting ruins, etc...).
One thing the developer could have tough of, is some kind of treasure hunt around the island... Oh well, maybe another time.
I did not test the online racing because I cancelled my gold account a few month ago. So I can give my opinion on this part of the game.
In conclusion, Testdrive Unlimited is an enjoyable game, but it should have given the player more incentive to go forward in the game. I've driven all around the island, and now, I don't feel like there is something else to do.