I absolutely love this game. The physics are great, and the game is amazingly awesome to play. There are almost no glaring flaws in this game. In fact, only one thing made me take off half of a star;
The pure difficulty of some of the Crash Mode levels. They're supposed to be puzzles of sorts, but a few are simply so hard, I couldn't figure it out, no matter how hard I tried. This was a very frustrating thing for me; playing for sometimes hours on one level, and always just missing by a few dollars for the gold. This gets very old after a while.
Still, getting past that, the game is simply a piece of pure art. The AI is one of the best in racing games, and this may quite possibly the only racing game franchise to use "slingshotting" in a completely, awesomely perfect way. The game is always a challenge, and is a great place to dump entire days into.
I highly recommend you buy this game - hell, ALL of the Burnout games.