It's certainly challenging, but I don't equate challenging to good.
That's the problem though - it's a rubbish arcade racer compared to Grid/Burnout etc.A lot of hexus fans will be critical of this game as it appears that most of us like sim racers instead of arcade racers.
It needs explaining?
They came close to making a good game.. it just needed a bit bigger ambition/budget and the whole thing being integrated together much better (as well as polish on the controls etc.)