This game is more fun than it's now low price warrant. I wish I had bought this game on release because there would have been more people online... HOWEVER, while I have never seen more than about 500-600 players online worldwide at any one time, I have never been unable to immediately join a game, be it a 10 man game or indeed the oh so fun 20 player games. Consider the low price now, too, and you would like to think the games popularity will increase somewhat again.
As for the gameplay, it looks great, you have a huge number (don't ask me how many but I'm still collecting) of licensed cars, and given that you can go from first to last, or vice verse, all in the final corner of a race, thrills are always there, from said photo finishes to blasting the car ahead into the are and speeding beneath them.
The weapons are very well balanced, both offensively and defensively. As for offline fun? I have actually played the single player offline game yet, but the 4-way split screen (with AI cars if you wish) is excellent!!!!
Basically, if Mario Kart is Katie Perry, then Blur is Gwen Stefani, which is still a damn good bang for your buck, albeit slightly ravaged through child birth... Anyway, get it, you won't regret it! See you online!!