I've anticipated this title since it was first announced ages ago, then called GTR. This is a good title for those that really appreciated forza and the "sim-like" feeling of the cars and have explored that "world" to the point where you feel like you need something new and fresh.
There are single player modes that will let you explore all aspects of the game and from my perspective single player wont offer any challenge unless you race with professional settings (assists off and hard ai, though automatic transmission is still allowed). My feeling is that this game is really made for racing with human opponents. So far I've only completed a few online races due to problem when connecting to ranked games.
I've not yet tried it with the Steering wheel, but I prefer the controller in forza and other racing games as well. It's very balanced with controller which naturally it must be for a console game.
The race line assist is poorly implemented compared to forza where it feels painted on the track and doesn't change dynamically to show where to break based on your speed. But I went straight into pro mode and only explored semi-pro and novice to get the achievements. I do believe that these modes are necessary for the casual racer.
Forza offers hours of exploration outside the pure racing with it's customization of cars and building your cars to match the different classes. From my perspective I also really appreciated the Livery editor and Auction house of forza. But again it's clear Race Pro focus on racing and only that.
Forza also has a fantastic official community with forum and this I can not find anywhere for Race Pro on Simbin or Atari's official page.
Race Pro let's you customize the settings very much and you can probably spend countless hours tuning to perfection. For me I appreciate the tuning possibilities, but more than anything I appreciated the possibility in forza to "borrow" tunings from the leaderboards to apply to cars in your own garage.
The lobby in Race Pro offer you to customize settings and try them out before the race starts which is very positive, this might however also have the effect of hanging more in the lobby waiting for a race to start.
If you haven't already got Forza 2 in your collection, you need not buy this title, if you do have Forza 2 and want more sim-style-racing I guess you've already bought this game :) if not do. For me Forza 2 is a 10/10 and this is 8/10. If you prefer arcade-style-racing go for pgr4.
I run full resolution 1920x1080 on a computer monitor with vga connection and graphics are a bit jerky which is a big downer, but it's still fully playable - it's just disappointing. I need to test this on a LCD-TV as well just to be sure it doesn't have anything to do with 50/60Hz issues.