Having found PGR3 a joy to play i found this a real let-down. From the needless inclusion of bikes (you hit them in a car and they go flying) to the ruining of the original kudos system, it seems the original formula which made PGR3 so good has been lost.
The graphics have been mildly improved, but new additions such as the bikes and weather system seem rushed and aren't particularly interesting (who wants to race hopelessly sliding about on ice?).
Gone has the arcade style with the cool garages - this has been replaced by a poorly produced career mode which is nothing but a chore to play (i found if you're losing a race you can just pause and restart it, this kind of removes the challenge). Half of the game is now down to driving bikes (which is painfully hard, mostly trying not to get knocked off - it's pretty obvious what happens when a car hits a bike! And unrealistic) - this does not interest me at all and is the worst failure of the game in my opinion.
So overall a sad death of a good franchise in my opinion, get PGR3 if you've not already, if you have enjoy it and don't get this!