Completed this tonight, it's not too bad in a 'going through the motions' kind of way. It is very different from Juiced however, where the handling is very unforgiving on anything other than FWD cars.
Most of the races are pretty easy and things get a bit repetitive after a while. Money is easy to come by and I finished the game with well over $25m in the bank. Drifting is kinda cool although the handling is ridiculous, in most games you drift at around 45-90 degrees whereas in J2:HIN you are often at more like 75-150 degrees.
The whole game is extremely arcadey (more so than the NFS series), the closest game I can think of to it is Street Racing Syndicate. One of the most unforgivable things is the fact that the framerate is capped at a jerky 30fps. The game doesn't look that amazing and I'm sure my system is capable of more - the only time I saw it dip under 30 was on a couple of the drift tracks which tend to be very open, and that was at 1680x1050x32 8xAA 16xAF max settings.
All in all I was say it is a very average game, not worth getting if you are the type of gamer who likes a challenge or a bit of realism in a racing game.