PGR 3 is a Must-Have
The gameplay is going to run very smooth. This time around - you cannot just run into a wall, spin around, do a few flips, and land back on your wheels rolling across the finish line for a 1st place finish. You actually have to go the appropriate speeds at which the track calls for. The only thing that I really didn't like in the gameplay was the lack of damage to the vehicles. This would have gave users a second thought before smashing into another car just to bump them out of thier way.
PGR's has a really wide variety as far as music/soundtracks goes. Which doesnt really matter on the 360 seeing how you can just play your own music from your HDD. By default settings, the ingame cars, and other things will be so loud that it will be almost impossible to hear the music playing anyways. This can become pretty annoying; however I"m sure that it can be fixed (I just havn't discovered how yet).
I really like what they have done with the online this time.. Everytime you do an Event offline - it automatically compares and shows where you are ranking up against the top players.
Also, the Gothem TV Live thing is pretty interesting when learning how to play - you can watch top competiters on XBL duke it out; try to feel what they are thinking when they head down the stretch to cross that checkered flag.
Overall I feel that PGR3 is a must-have for your XBOX360. It is indeed the Best Racing game for the 360.